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Bad U-joint?
I have a problem that I noticed with my pick-up truck.
The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i |
Bad U-joint?
On Mon, 07 Oct 2013 21:08:54 -0500, Ignoramus3720
wrote: I have a problem that I noticed with my pick-up truck. The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i Any squeaks? Particularly backing up slowly? Any "clunk" starting in either direction. If so, suspect a "U" joint. If you have a bad one, change them all at once. |
Bad U-joint?
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Bad U-joint?
Ignoramus3720 wrote:
I have a problem that I noticed with my pick-up truck. The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i Could be u-joints . Easy to check - put the parking brake on , gear shift in neutral . Might want to chock the wheels , I don't usually . Slide under the truck and rotate/shake the driveline . If you see movement in the joint it's shot . -- Snag |
Bad U-joint?
On Mon, 7 Oct 2013 22:20:59 -0500, "Snag" wrote:
Ignoramus3720 wrote: I have a problem that I noticed with my pick-up truck. The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i Could be u-joints . Easy to check - put the parking brake on , gear shift in neutral . Might want to chock the wheels , I don't usually . Slide under the truck and rotate/shake the driveline . If you see movement in the joint it's shot . It can be shot with no appreciable looseness. The joint can be tight instead of loose and still cause a shake. Generally these squeak, or "chirp" |
Bad U-joint?
On Monday, October 7, 2013 7:08:54 PM UTC-7, Ignoramus3720 wrote:
I have a problem... That's the first step toward recovery. In your case you still have a long, long way to go. |
Bad U-joint?
In article , "Snag"
wrote: Ignoramus3720 wrote: I have a problem that I noticed with my pick-up truck. The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i Could be u-joints . Easy to check - put the parking brake on , gear shift in neutral . Might want to chock the wheels , I don't usually . Slide under the truck and rotate/shake the driveline . If you see movement in the joint it's shot . From what you said I suspect it's wheel related. Out of balance tires often act up within certain speed 'bands'. If wheel speed vibration frequency sounds right, look for loose lugs and missing wheel weights (there will usually be a dirt 'witness mark' on the rim where a lost weight was). Look at both sides, inside and out. Look over the wheels/tires for obvious things like ply separations, wads of stuck on spooge or whatnot. A bad front wheel bearing/s can sometimes produce vibrations that vary with vehicle speed... and as they get worse can even induce an eerie low pitch 'humming' like sound into the vehicle. I haven't run into many of these, but the ones I have were more felt than heard, and sometimes seemingly originate from 'everywhere'. If after all the driveshaft is suspected, go under shake/wiggle as mentioned above looking for joint slop. (RWD driveshafts rotate much faster than wheels, so if responsible, the frequency will be a good bit faster.) If you can quickly (and safely) dash under the truck immediately after driving, feel for hot bearing cups. Use caution, a bad one might be quite hot. If so equipped, look at the shaft center support & bearing... check it for mounting security and bearing slop. Look over the shaft itself for stuck on spooge, foreign matter like rope, extension cord or the like wrapped around, missing bolts, physical damage etc. Also, some vehicles have a fair sized weight bolted to the transmission output shaft housing to 'soak up' vibration. If you have one, be sure it's tight. While there, grab the output housing or front of the drive shaft, shake and check for a busted or sloppy rear engine mount. Not a bad idea to look over all this stuff whenever your down there, vibration or not. Just look over every thing in general with an emphasis on delicate stuff, like brake hoses/lines, exposed wiring & connectors, CV boots and on and on. Good luck, let us know how it turns out. Erik |
Bad U-joint?
"Ignoramus3720" wrote in message ... I have a problem that I noticed with my pick-up truck. The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? Your transmission is going out, not worth fixing, time to scrap it and find a new truck |
Bad U-joint?
On Mon, 07 Oct 2013 19:54:25 -0700, Larry Jaques
wrote: On Mon, 07 Oct 2013 22:24:33 -0400, wrote: On Mon, 07 Oct 2013 21:08:54 -0500, Ignoramus3720 wrote: I have a problem that I noticed with my pick-up truck. The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i Any squeaks? Particularly backing up slowly? Any "clunk" starting in either direction. If so, suspect a "U" joint. If you have a bad one, change them all at once. I'll second all of that. Me three. "The socialist movement takes great pains to circulate frequently new labels for its ideally constructed state. Each worn-out label is replaced by another which raises hopes of an ultimate solution of the insoluble basic problem of Socialism, until it becomes obvious that nothing has been changed but the name. The most recent slogan is "State Capitalism."[Fascism] It is not commonly realized that this covers nothing more than what used to be called Planned Economy and State Socialism, and that State Capitalism, Planned Economy, and State Socialism diverge only in non-essentials from the "classic" ideal of egalitarian Socialism. - Ludwig von Mises (1922) |
Bad U-joint?
Erik fired this volley in news:spam-984467.22445207102013
@news.dslextreme.com: From what you said I suspect it's wheel related. Out of balance tires often act up within certain speed 'bands'. Really? Even when he said it ONLY happens when accelerating in that speed band, but not when coasting or decelerating? Unless he's got a horrible tread separation, there's no "drive vs. coast" defect I'm aware of in tires that could cause that symptom. Lloyd |
Bad U-joint?
Ignoramus3720 fired this volley in
: I have a problem that I noticed with my pick-up truck. The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i In addition to the suggestions about U-joints and trannies (but not tires), It could be a torque/speed problem related to the engine performance. It might be missing at a certain torque and speed AND vehicle speed range. I lean more toward it's being a tranny problem. When's the last time you completely drained, flushed, and re-filled the transmission? Lloyd |
Bad U-joint?
"Erik" wrote in message
... In article , "Snag" wrote: Ignoramus3720 wrote: I have a problem that I noticed with my pick-up truck. The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. What could it be? i From what you said I suspect it's wheel related. Out of balance tires often act up within certain speed 'bands'. Erik I had a puzzling speed-related vibration problem that turned out to be a rusted-out upper shock mount in the front. It's out of sight behind a flange on the spring mount so I only found it when I bumped the shock and it moved. Other than a slight steering wheel shake at certain speeds the truck handled normally. The factory manual says when replace the rivets holding such things to the frame with bolts, use Grade 8 one size larger. jsw |
Bad U-joint?
On Tue, 08 Oct 2013 05:35:29 -0500, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote: Erik fired this volley in news:spam-984467.22445207102013 : From what you said I suspect it's wheel related. Out of balance tires often act up within certain speed 'bands'. Really? Even when he said it ONLY happens when accelerating in that speed band, but not when coasting or decelerating? Unless he's got a horrible tread separation, there's no "drive vs. coast" defect I'm aware of in tires that could cause that symptom. Lloyd A relatively minor tread separation CAN cause an under-load shake - but will usually also shake under moderate braking. |
Bad U-joint?
On Tue, 08 Oct 2013 05:38:36 -0500, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote: Ignoramus3720 fired this volley in : I have a problem that I noticed with my pick-up truck. The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i In addition to the suggestions about U-joints and trannies (but not tires), It could be a torque/speed problem related to the engine performance. It might be missing at a certain torque and speed AND vehicle speed range. I lean more toward it's being a tranny problem. When's the last time you completely drained, flushed, and re-filled the transmission? Lloyd We are talking about the old horses vs zebras vs unicorns thing here again. Check for horses first. For all it takes to pull a driveshaft, just pop it out and chech each joint for play/stiffness. Mabee half an hour's work on a bad day? And if the joints are bad, you have 1/4 of the work done already. |
Bad U-joint?
wrote in message
... It can be shot with no appreciable looseness. The joint can be tight instead of loose and still cause a shake. Generally these squeak, or "chirp" Can you generally tell by unbolting the flange and wiggling the u-joint by hand? The few I've worked on were pretty obviously bad once freed from the tranny or differential. The OEM ones were "lubed for life", so their life ended when the lube ran out. I've heard that sticky driveshaft slip joint splines can cause strange symptoms. jsw |
Bad U-joint?
On Tue, 08 Oct 2013 05:38:36 -0500, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote: Ignoramus3720 fired this volley in : I have a problem that I noticed with my pick-up truck. The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i In addition to the suggestions about U-joints and trannies (but not tires), It could be a torque/speed problem related to the engine performance. It might be missing at a certain torque and speed AND vehicle speed range. I lean more toward it's being a tranny problem. When's the last time you completely drained, flushed, and re-filled the transmission? Since it's not a Ford, with their damnable 4sp OD tranny, I strongly doubt it. Mine felt like it was missing in 4th at 75 during heavy accelleration. -- Win first, Fight later. --martial principle of the Samurai |
Bad U-joint?
Ignoramus3720 fired this volley in
: I have a problem that I noticed with my pick-up truck. The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i What kind of truck, age, mileage, engine size and all? I've been thinking about this, last few hours. With the "worse on accel", it sounds familiar. One email friend of mine suggests it might be tune up and ignition related. Might be missing on one cylinder, which is worse on accel (timing advance). .. Christopher A. Young Learn about Jesus www.lds.org .. |
Bad U-joint?
On 2013-10-08, Stormin Mormon wrote:
Ignoramus3720 fired this volley in : I have a problem that I noticed with my pick-up truck. The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i What kind of truck, age, mileage, engine size and all? I've been thinking about this, last few hours. With the "worse on accel", it sounds familiar. One email friend of mine suggests it might be tune up and ignition related. Might be missing on one cylinder, which is worse on accel (timing advance). Certainly a possibility. i |
Bad U-joint?
The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i Vibration on accel occurs when the distributor vacuum advance is activated. I'd be looking at ignition wires, spark plugs, etc. -- .. Christopher A. Young Learn about Jesus www.lds.org .. |
Bad U-joint?
On Monday, October 7, 2013 10:08:54 PM UTC-4, Ignoramus3720 wrote:
I have a problem that I noticed with my pick-up truck. The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i In the could-also-be-in-addition-to-what's-been-mentioned department... Depending on the pickup, if it has a 2-piece driveshaft with a carrier the carrier bearing could be shot, or just the rubber supporting he carrier could be shot. Usually midsize pickups are the biggest with this arrangement, so probably not relevant. Could also be a worn out slider (where it fits into the trans with a 1-piece shaft), or just bad output bearings in the trans. Dave |
Bad U-joint?
On Tue, 8 Oct 2013 08:38:50 -0400, "Jim Wilkins"
wrote: wrote in message .. . It can be shot with no appreciable looseness. The joint can be tight instead of loose and still cause a shake. Generally these squeak, or "chirp" Can you generally tell by unbolting the flange and wiggling the u-joint by hand? The few I've worked on were pretty obviously bad once freed from the tranny or differential. The OEM ones were "lubed for life", so their life ended when the lube ran out. I've heard that sticky driveshaft slip joint splines can cause strange symptoms. jsw Can virtually always feel it when unbolted. |
Bad U-joint?
On Tue, 08 Oct 2013 09:13:48 -0400, Stormin Mormon
wrote: Ignoramus3720 fired this volley in : I have a problem that I noticed with my pick-up truck. The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i What kind of truck, age, mileage, engine size and all? I've been thinking about this, last few hours. With the "worse on accel", it sounds familiar. One email friend of mine suggests it might be tune up and ignition related. Might be missing on one cylinder, which is worse on accel (timing advance). . Christopher A. Young Learn about Jesus www.lds.org . Looking for unicorns again, stormy. Or at least Zebras. If you want to look for Zebras I've got another one for you. I started feeling a bit of a shake at 95Kph recently on my Ranger. Not consistant - and it went away when I backed out of the throttle or declutched. Dead smooth when declutched. Checked the tires last evening and guess what I found? One rear tire was about 10psi low - and the truck has posi. Aired up, and no more shake on accelleration. Not a horse, but not a unicorn either. Mabee not a zebra - mabee a mule??? |
Bad U-joint?
On Tue, 08 Oct 2013 17:22:57 -0400, Stormin Mormon
wrote: The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i Vibration on accel occurs when the distributor vacuum advance is activated. I'd be looking at ignition wires, spark plugs, etc. How old is the vehicle to still have vacuum advance???? Have not seen what make and model vehicle are we talking about??? There are some things that are very common on one vehicle that you might never see on another one. |
Bad U-joint?
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Bad U-joint?
On Monday, October 7, 2013 8:08:54 PM UTC-6, Ignoramus3720 wrote:
I have a problem that I noticed with my pick-up truck. The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately.. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i Worn suspension arm bushings caused that in my case, the upper suspension arm bonded bushings had deteriorated to the point where there was only shreds of rubber left. The lowers still had the rubber but the bonding to the inner sleeve was gone. I had another vehicle that still had the original factory tie rod ends, these were also bonded rubber and had gone away. Only rattled at certain speeds and really didn't affect steering, somehow. The parts for these replacements were pretty cheap, had to have a heavy press to replace the bushings. Have had to do this now on several vehicles since I tend to run them until they go to the junkyard. Upper bushings are hard to see on a lot of vehicles, hard to get to, too. Bum ball joints will do this, also, but you usually get a vague drifting feel with the steering when that happens. So check your suspension. Only real way I know of is to detach the upper ball joint, get the spring out and see if there's play on arms or ball joints. Now that I know how, I can usually do both ball joints and bushings on a Sat. Don't go for super-cheap suspension parts or you'll get to do it again quite soon. I've had regular Hooke's u-joints go bad with the needles rusted out and gone, never really had any vibration at speed but had a loud clunk when shifting into reverse, this was on an old IH Scout with a three-speed manual and 4WD. Never really caught on until I downshifted on the highway and the stubs broke off on the cross on the front joint. Very noisy. Was my dad's truck when I was a teen and he plowed all winter with it. Didn't get much maintenance in sub-zero. You should be able to check for u-joint play by jacking up a rear wheel and twisting the drive shaft back and forth by hand. I've also see vibration checked for by putting the vehicle on a lift with the wheels free and running it up to speed with a mechanic looking underneath for drivetrain vibration. It's a last resort, very dangerous, stay clear because rocks can come flying out of the tire treads. If no vibration that way, it's got to be suspension or front wheel bearings. Stan |
Bad U-joint?
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Bad U-joint?
On Wed, 09 Oct 2013 20:37:37 +0800, Glenn B
wrote: On 9/10/2013 4:39 PM, wrote: On Monday, October 7, 2013 8:08:54 PM UTC-6, Ignoramus3720 wrote: I have a problem that I noticed with my pick-up truck. The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i Worn suspension arm bushings caused that in my case, the upper suspension arm bonded bushings had deteriorated to the point where there was only shreds of rubber left. The lowers still had the rubber but the bonding to the inner sleeve was gone. I had another vehicle that still had the original factory tie rod ends, these were also bonded rubber and had gone away. Only rattled at certain speeds and really didn't affect steering, somehow. Amazing. It should have been wandering all over the road after you hit even a slight bump. The parts for these replacements were pretty cheap, had to have a heavy press to replace the bushings. Have had to do this now on several vehicles since I tend to run them until they go to the junkyard. Upper bushings are hard to see on a lot of vehicles, hard to get to, too. Bum ball joints will do this, also, but you usually get a vague drifting feel with the steering when that happens. So check your suspension. Only real way I know of is to detach the upper ball joint, get the spring out and see if there's play on arms or ball joints. Now that I know how, I can usually do both ball joints and bushings on a Sat. Don't go for super-cheap suspension parts or you'll get to do it again quite soon. Amen to that. I've had regular Hooke's u-joints go bad with the needles rusted out and gone, never really had any vibration at speed but had a loud clunk when shifting into reverse, this was on an old IH Scout with a three-speed manual and 4WD. Never really caught on until I downshifted on the highway and the stubs broke off on the cross on the front joint. Very noisy. Was my dad's truck when I was a teen and he plowed all winter with it. Didn't get much maintenance in sub-zero. You should be able to check for u-joint play by jacking up a rear wheel and twisting the drive shaft back and forth by hand. I heard a Mexi-mobile (some funky old chebby) take off from a parking lot once. EEK-OOK-EEK-OOK-EEK-OOK from zero to 15mph or so. Must have driven the driver crazy. It was a pole-vaulting event waiting to happen. When front u-joints let go, it can make for spectacular crashes on the freeway. I had a truck's rear u-joint go while I was following it once. The center flew out and hit my windshield right between my eyes. Luckily, it was spinning beneficially to the slant of the windshield, so my F-150 glass only got a shearing scratch there, no puncture. Most of it polished out. I was -really- lucky that day. A truck cross through the forehead would have kinda hurt. I avoided the drive shaft which the truck jumped over because I was in the next lane over by that time. Talk about adrenaline shakes... I've also see vibration checked for by putting the vehicle on a lift with the wheels free and running it up to speed with a mechanic looking underneath for drivetrain vibration. It's a last resort, very dangerous, stay clear because rocks can come flying out of the tire treads. If no vibration that way, it's got to be suspension or front wheel bearings. Stan .......... or a front tyre issue (I just had one!) I thought I had a wheel bearing problem in front RHS. Felt ok by hand when jacked up but made noise at, and varied with speed. I got a puncture in the RHF & the noise disappeared when the spare was fitted to the RHF. Tyre looks ok, seems to run true & is balanced. Beats me why its noisy. I've put it on the rear and don't notice any noise now. Prolly ply sep in the tread area. They're easier to diagnose in the sidewall, where you can physically see them through the thinner rubber layer. -- Win first, Fight later. --martial principle of the Samurai |
Bad U-joint?
I investigated this further. The drive shaft (prop shaft) does not
appear to be loose. The vibration seems to be related to a gear. If I drive wnd watch RPM, at around 35 MPH, the vibration starts as soon as the RPM drops, indicating a gear change. Again, it only appears when I push on gas, and seems to be further limited to that gear. i On 2013-10-08, Ignoramus3720 wrote: I have a problem that I noticed with my pick-up truck. The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i |
Bad U-joint?
I had a truck's rear u-joint go while I was following it once. The center flew out and hit my windshield right between my eyes. Luckily, it was spinning beneficially to the slant of the windshield, so my F-150 glass only got a shearing scratch there, no puncture. Most of it polished out. I was -really- lucky that day. A truck cross through the forehead would have kinda hurt. I avoided the drive shaft which the truck jumped over because I was in the next lane over by that time. Talk about adrenaline shakes... Reminded me of this video: http://www.youtube.com/watch?v=rOhgMAOrp0c As a kid I remember my dad coming home one day and telling us of a lost driveshaft scare he's had... IIRC he said it came from the opposite side of the freeway bouncing/flailing end over end through traffic, hopped the center divider for another bounce or two before impaling itself javelin style into an ice-plant covered embankment. I've heard, (but don't know to be fact) that US Federal Motor Vehicle Safety Standards now require vehicles contain and prevent driveshaft separation in the event of joint failure. Erik |
Bad U-joint?
"Ignoramus27351" wrote in
message ... I investigated this further. The drive shaft (prop shaft) does not appear to be loose. Mine didn't either. IIRC wiggling a jacked-up tire showed the loose u-joint better than trying to turn the driveshaft when the wheels were on the ground and the parking brake applied. Unbolting it was even better but I had to go out to buy a 12mm 12 point flex socket to get the front one off, and more importantly to torque it back on. jsw |
Bad U-joint?
On 09/10/13 17:49, Erik wrote:
I had a truck's rear u-joint go while I was following it once. The center flew out and hit my windshield right between my eyes. Luckily, it was spinning beneficially to the slant of the windshield, so my F-150 glass only got a shearing scratch there, no puncture. Most of it polished out. I was -really- lucky that day. A truck cross through the forehead would have kinda hurt. I avoided the drive shaft which the truck jumped over because I was in the next lane over by that time. Talk about adrenaline shakes... Reminded me of this video: http://www.youtube.com/watch?v=rOhgMAOrp0c As a kid I remember my dad coming home one day and telling us of a lost driveshaft scare he's had... IIRC he said it came from the opposite side of the freeway bouncing/flailing end over end through traffic, hopped the center divider for another bounce or two before impaling itself javelin style into an ice-plant covered embankment. I've heard, (but don't know to be fact) that US Federal Motor Vehicle Safety Standards now require vehicles contain and prevent driveshaft separation in the event of joint failure. Erik When I was living in Wichita around 1981 a woman was killed when a IIRC plastic drain fitting fell off another vehicle and smashed through her windscreen. I myself have received minor facial cuts when a rock was jettisoned from a tipper truck, possibly having been stuck between the twin rear wheels, hit the back edge of the bonnet (US hood) and smashed the windscreen in front of me puncturing the laminated interlayer, fortunately I saw it coming in time the shut my eyes. Luckily no one else was in the car as they would have been showered in glass shards. I was surprised just how much glass was in the car from front to back, it got everywhere. |
Bad U-joint?
Ignoramus27351 wrote:
I investigated this further. The drive shaft (prop shaft) does not appear to be loose. The vibration seems to be related to a gear. If I drive wnd watch RPM, at around 35 MPH, the vibration starts as soon as the RPM drops, indicating a gear change. Again, it only appears when I push on gas, and seems to be further limited to that gear. Oh OH! That is NOT a good symptom. It may be a combination of gear and speed, but if it really is only in one gear, it could mean transmission trouble. Jon |
Bad U-joint?
Jon Elson fired this volley in
: it could mean transmission trouble. Really? G (not making fun of you, Jon. It's just that the idea was ridiculed not 24 hours ago.) Lloyd |
Bad U-joint?
On 2013-10-09, Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote:
Jon Elson fired this volley in : it could mean transmission trouble. Really? G (not making fun of you, Jon. It's just that the idea was ridiculed not 24 hours ago.) Lloyd Just making sure, I think that I did not ridicule anything. I hope. Anyway, this pick-up towed a lot of stuff. So, while I would hate the idea of transmission trouble, it could mean that. I will have one mbile mechanic I trust stop by tomorrow, I will see what he says. i |
Bad U-joint?
Ignoramus27351 fired this volley in
: I think that I did not ridicule anything. No, you didn't, Ig. High-rate stumbling in one gear is a pretty sure sign of a clutch failing (rapidly, at this point). It's not _always_ expensive, but almost always involves a 'pro'. Lloyd |
Bad U-joint?
On 09/10/13 23:10, Lloyd E. Sponenburgh wrote:
Ignoramus27351 fired this volley in : I think that I did not ridicule anything. No, you didn't, Ig. High-rate stumbling in one gear is a pretty sure sign of a clutch failing (rapidly, at this point). It's not _always_ expensive, but almost always involves a 'pro'. Lloyd Your clutch comment reminded me of a mate in high school in Wichita around 1982 and he had an odd vibration on his pick-up and when the school shop looked at it they found the flywheel had a crack around the central hub about 3/4 of the way round by the time they pulled it. |
Bad U-joint?
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Bad U-joint?
On Wed, 09 Oct 2013 07:01:18 -0700, Larry Jaques
wrote: On Wed, 09 Oct 2013 20:37:37 +0800, Glenn B wrote: On 9/10/2013 4:39 PM, wrote: On Monday, October 7, 2013 8:08:54 PM UTC-6, Ignoramus3720 wrote: I have a problem that I noticed with my pick-up truck. The problem is that at certain speeds, such as 40-45 MPH, I feel vibration if I step on the gas pedal and try to accelerate. If I let go of the gas pedal, vibration stops even as the truck continues to drive forward. It has gotten worse lately. I have thought a lot on what could cause it. It does not seem to be related to the engine RPM. I watch the RPM vary and the vibration does not vary with it. What could it be? i Worn suspension arm bushings caused that in my case, the upper suspension arm bonded bushings had deteriorated to the point where there was only shreds of rubber left. The lowers still had the rubber but the bonding to the inner sleeve was gone. I had another vehicle that still had the original factory tie rod ends, these were also bonded rubber and had gone away. Only rattled at certain speeds and really didn't affect steering, somehow. Amazing. It should have been wandering all over the road after you hit even a slight bump. The parts for these replacements were pretty cheap, had to have a heavy press to replace the bushings. Have had to do this now on several vehicles since I tend to run them until they go to the junkyard. Upper bushings are hard to see on a lot of vehicles, hard to get to, too. Bum ball joints will do this, also, but you usually get a vague drifting feel with the steering when that happens. So check your suspension. Only real way I know of is to detach the upper ball joint, get the spring out and see if there's play on arms or ball joints. Now that I know how, I can usually do both ball joints and bushings on a Sat. Don't go for super-cheap suspension parts or you'll get to do it again quite soon. Amen to that. I've had regular Hooke's u-joints go bad with the needles rusted out and gone, never really had any vibration at speed but had a loud clunk when shifting into reverse, this was on an old IH Scout with a three-speed manual and 4WD. Never really caught on until I downshifted on the highway and the stubs broke off on the cross on the front joint. Very noisy. Was my dad's truck when I was a teen and he plowed all winter with it. Didn't get much maintenance in sub-zero. You should be able to check for u-joint play by jacking up a rear wheel and twisting the drive shaft back and forth by hand. I heard a Mexi-mobile (some funky old chebby) take off from a parking lot once. EEK-OOK-EEK-OOK-EEK-OOK from zero to 15mph or so. Must have driven the driver crazy. It was a pole-vaulting event waiting to happen. When front u-joints let go, it can make for spectacular crashes on the freeway. A highschool classmate had a big-block '67 Chevy that he used to drive pretty hard - Tearing down the street behind the school and speedshifting, he took out the front U-joint and poked the driveshaft right through the diff into the gas-tank - lifting the rear bumper a few feet in the process and tearing a furrow in the asphault. I had a truck's rear u-joint go while I was following it once. The center flew out and hit my windshield right between my eyes. Luckily, it was spinning beneficially to the slant of the windshield, so my F-150 glass only got a shearing scratch there, no puncture. Most of it polished out. I was -really- lucky that day. A truck cross through the forehead would have kinda hurt. I avoided the drive shaft which the truck jumped over because I was in the next lane over by that time. Talk about adrenaline shakes... Had the rear U-Joint let go on the AeroScare on the way from Kitchener to Winnipeg, via Michigan. I had the u-joint replaced by a shop while I was out of the country in Burkina Faso for a month, knowing I had the winnipeg trip coming up as soon as I got home, taking my daughter to University. The mechanic who installed it didn't get the retainer clip in right and it threw a cup just east of Flint, friday of the Labour Day weekend. No tools in the truck - no shop able to do the job - changed it laying on my back under the truck with a combination of borrowed tools and a vice and hammer I bought at the parts store where I bought the U-Joint. I've also see vibration checked for by putting the vehicle on a lift with the wheels free and running it up to speed with a mechanic looking underneath for drivetrain vibration. It's a last resort, very dangerous, stay clear because rocks can come flying out of the tire treads. If no vibration that way, it's got to be suspension or front wheel bearings. Stan .......... or a front tyre issue (I just had one!) I thought I had a wheel bearing problem in front RHS. Felt ok by hand when jacked up but made noise at, and varied with speed. I got a puncture in the RHF & the noise disappeared when the spare was fitted to the RHF. Tyre looks ok, seems to run true & is balanced. Beats me why its noisy. I've put it on the rear and don't notice any noise now. Prolly ply sep in the tread area. They're easier to diagnose in the sidewall, where you can physically see them through the thinner rubber layer. |
Bad U-joint?
On Wed, 09 Oct 2013 14:28:45 -0500, Jon Elson
wrote: Ignoramus27351 wrote: I investigated this further. The drive shaft (prop shaft) does not appear to be loose. The vibration seems to be related to a gear. If I drive wnd watch RPM, at around 35 MPH, the vibration starts as soon as the RPM drops, indicating a gear change. Again, it only appears when I push on gas, and seems to be further limited to that gear. Oh OH! That is NOT a good symptom. It may be a combination of gear and speed, but if it really is only in one gear, it could mean transmission trouble. Jon If it seams like it might be transmission related, get a can of BG ATC. If it is a sticky or floating valve in the trans it could quite possibly solve the problem and it definitely won't hurt. It won't fix a mechanical problem - but can solve accumulator and valve related issues, as well as some friction material issues. If it makes a difference you KNOW it is transmission related and you can decide how much you are willing to do to the tranny. If it doesn't help, it's only about 8 bucks. |
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