t-5 experts come!

5.0fox said:
Can i use the 4th gear and cluster gear out of an 87 t-5 in a 91 t-5?

C'mon guys, you missed this.

There is no 4th gear in a T-5. 4th gear is achieved by joining the input and output shaft together for a 1:1 ratio.

If you use the counter gear from the 87 T-5, you'll need the matching speed gears for 2nd and 3rd. The gear ratios are different and the 85-89 ratios will not interchange with 90-93 ratios.

Synchros, sliders and shift forks will interchange fine, it's the gears that are the problem. 5th gears and 3.37 1sts are the same, but if you swap the counter gear from the 87 trans to the 91 trans, you'll need to use the '87's 2nd and 3rd as well
 
Mustang5L5 said:
C'mon guys, you missed this.

There is no 4th gear in a T-5. 4th gear is achieved by joining the input and output shaft together for a 1:1 ratio.

If you use the counter gear from the 87 T-5, you'll need the matching speed gears for 2nd and 3rd. The gear ratios are different and the 85-89 ratios will not interchange with 90-93 ratios.

Synchros, sliders and shift forks will interchange fine, it's the gears that are the problem. 5th gears and 3.37 1sts are the same, but if you swap the counter gear from the 87 trans to the 91 trans, you'll need to use the '87's 2nd and 3rd as well

Nice catch. The gears have a different tooth count between those two years due to the better alloy gear design in the newer transmissions.
 
well on the borg warner tags they say they are years 86 and 90. but i just need to use the 2nd gear form the 91 in the 87. is this possible? i counted the teath and both have 31 so is the overall size of the gears different? help guys!

also i dont need to swap 4th gears and cluster anymore i just need to put the 91 2nd gear in the 87
 
See http://www.ttcautomotive.com/English/onlineorder/product.asp to download a FREE service manual for T5 or Tremec 3550
You will need the Adobe Acrobat viewer which is also a free download – http://www.adobe.com/products/acrobat/readstep2.html

See http://www.hanlonmotorsports.com/ or http://www.ddperformance.com/index2.htm for parts

A T5 rebuild kit with syncros, bearings and other small parts costs about $160. It does not include any gears or shafts.

http://cartapes.com also has a video on how to rebuild your T5 or Tremec. It costs less than $20, and is worth every penny of it.