A rumble will also come from the output bushing area of the transmission
where the half-shafts exit the tranny. This sometimes sounds like a rump,
rump, rump at certain speeds. My Lincoln only did it at 28 MPH. Also be
aware that a slight swerve under speed will help pinpoint drivetrain noises.
On a front wheel drive, the front wheel bearings may make more noise as they
UNLOAD, opposite from a rear wheel drive 's front wheels, where they make
more rumble when loaded in a swerve. I learned this one the expensive way,
and my tranny specialist friend confirmed this later.

RJ

"wws" wrote in message
...
axolotl wrote:
I'm trying to isolate the cause of drive train noise in my son's 1991
Prizm (Toyota Corolla). The best I can characterize the noise is a
whine, with a rumble component that turns to a loose clatter on
deceleration. I can hear noise from the driver's side CV as I turn the
wheel by hand. What steps (besides serial parts replacement) can I use
to determine if the noise is being generated by the CV, the wheel
bearing or (minor chords here) the transaxle?

Thanks,

Kevin Gallimore



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A cv will clackety clack when turning, the rumble is the bearing.
Fixed one once that was too loud to hear the radio.
Or anything else.

wws