Fox T-Bird/Cougar Forums

Technical => Drivetrain Tech => Topic started by: freakaftr8 on June 02, 2008, 05:28:54 PM

Title: Trans AM T5 tranny into my 84 tbird
Post by: freakaftr8 on June 02, 2008, 05:28:54 PM
Hey guys, I ran into a friend that gave me a T5 tranny out of a Pontiac Trans AM V8. I know I will need a ford bell housing, but would this T5 work for my conversion on my 84 tbird 5.0?
Title: Trans AM T5 tranny into my 84 tbird
Post by: Chuck W on June 02, 2008, 07:16:10 PM
Doubtful.

The input and output shaft splines are most likely different as well as the shifter location.
Title: Trans AM T5 tranny into my 84 tbird
Post by: HAVI on June 02, 2008, 08:22:41 PM
The T5's used behind the four cylinder GM engines used the 'Ford' main case-to-bell housing bolt pattern. The GM V6 (thru the 1992 model year) and V8 versions used the GM trans-to-bell bolt pattern. The Chevy/GM 4 cylinder and V6 trans used a 1" diameter x 14 spline input shaft, while all Ford T5's used a 1-1/16" diameter x 10 spline input shaft.

GM 2WD T5's used a 27 spline output shaft; Ford used a 28 spline output.

If you have the money these guys might help:  http://ddperformance.com/
Title: Trans AM T5 tranny into my 84 tbird
Post by: freakaftr8 on June 02, 2008, 08:27:04 PM
That sucks.... Oh well, it was worth the try. Thanks guys
Title: Trans AM T5 tranny into my 84 tbird
Post by: Thunder Chicken on June 02, 2008, 11:36:00 PM
I've read that the tranny behind the 3800's in newer F-bodies is very much like the Ford T-5 (uses Ford-style bellhousing mounting points, shifter in Ford location, etc). I believe i read it in a Hot Rod magazine, where a guy asked if he could use the V6 tranny behind his SBC and they told him no, because it was more like the Ford tranny (also, isn't the Chevy V8 T5 rotated a bit?).

As for input shafts - as long as it was the same length and a suitable pilot bearing/bushing could be found, could the shaft size and number of splines be overcome by using a Chevy clutch disc with a Ford pressure plate (assuming same diameter)?
Title: Trans AM T5 tranny into my 84 tbird
Post by: 5.0 tbird on June 03, 2008, 03:05:54 PM
Yah, the F-body V8 T5s are supposed to be angled toward the driver.
Title: Trans AM T5 tranny into my 84 tbird
Post by: HAVI on June 03, 2008, 08:14:56 PM
and yes you can use the chevy 10" clutch (actual diameter is more like 9.25") Ford pressure plate and a couple little mods that I forget.  I've been researching this as I'm putting an S10 T5 behind my 8BA flathead.
Title: Trans AM T5 tranny into my 84 tbird
Post by: CatCarMan2012 on June 04, 2008, 09:45:11 AM
Sell it on ebay and use the profits to buy a mustang T-5.  Just my $0.02