On Mon, 09 Feb 2004 19:44:39 GMT, Ernie Leimkuhler wrote:

|In article , F.
|Hayek wrote:
|
| In article ,
| Ernie Leimkuhler wrote:
|
| I though these adpater bell housings were already available off the
| shelf for a few $100.
|
| Not for this application. What I'm trying to do is mate up a Toyota
| Supra Turbo 7M-GTE motor with an R series transmission in a Toyota
| pickup truck. The Turbo Supras also used R series trannys but they had a
| longer inputshaft (+30mm) than the R series truck trannys (same diameter
| and spline though). The Supra tranny is undesirable for 4x4 trucks
| because it has a higher first gear and you can't change that gear
| without changing the input shaft to a truck input, which would then be
| too short. The truck trannys will bolt right up to a Supra bellhousing
| but the input shaft will be 30mm too short. A pilot bearing adapter that
| moved the pilot bearing 30mm out to the input shaft seems like it would
| interfere with the clutch disk hub.
|
| The most desirable R series truck transmission has a 4.31 to 1 first
| gear and the Supra tranny has a 3.21 to 1 first gear.
|
| The 5 sp. transmission used in a 1996 or later Tacoma is also an R
| series and it will also bolt right up to the Supra bellhousing, but, it
| has a different tail housing (for mounting the transfer case). A company
| called Marlin Crawler makes an excellent adapter to mate the correct
| tranfer case to this transmission for $349, but (yes another but) the
| first gear ratio in the Tacoma trans is 3.89 to 1, which is better than
| the Supra ratio and not as good as the earlier transmission with the
| 4.31 ratio. There is no gearset available to change the ratio in the
| Tacoma trans to a lower ratio as Toyota changed the helical cut on the
| gears in 1996.
|
| It would be possible to have a longer custom input shaft made, but these
| inputs also have and integral bearing race and a gear; they are not just
| a simple shaft, so a "one off" job might be prohibitively expensive
| (although I'd welcome input on that).
|
| The easy answer looks to be a stock Supra bellhousing and clutch, Tacoma
| transmission, a $349 transfercase adapter and live with the 3.89 first
| gear. My only worry is that the Supra motor, while it has good low end
| torque, displaces only 3.0 liters and probably could benefit from a
| lower first gear in this application. I guess it works well enough in
| the Tacoma behind the 3.4 V6, but heck I want to do better than stock :-)
|
| Fred
|
|Believe it or not I get it.
|
|A custom Bellhousing could be done, but it requires high skill.
|I know I could do it, but I would have trouble finding more than 2
|other people I know who could do it.

These guys can do it: www.taylor-race.com
Craig Taylor is the nicest and most knowledgable guy you will meet on
performance drivetrains. Located in the DFW area, but ships all over the world
Rex in Fort Worth