Fox T-Bird/Cougar Forums  

I wish I hadn't just bought the wife a Edge.  I LOVE my birds, Id let her daily drive the GT and Id love to rock that beautiful bird.  Hope you sell it to someone who is going to treat her right.

I was just wondering why a discussion on a 5 Speeder. The T56 is as strong as a TKO600 and has an additional gear to boot. Basically you can run real stout final drive gears with a T56. In my view the TKO in 2.87 first gear ratio configuration is a good tranny but it lacks the needed sixth gear to be a real good choice. Like i said T56 is what i would do and i would not look back for one second!!

Tremec has manufactured and is currently manufacturing the following:

T-5 (used to be owned by Borg Warner but Tremec bought them a few years back)
3550 - no longer manufactured, input shaft is an 10 spline and output shaft is a 28 spline so it works with the clutch that the T-5 was behind thus pretty popular replacement for the T-5 back in the day
TKO - no longer manufactured, input shaft is a 26 spline and the output shaft is a 31 spline which required a new clutch and yolk for the trans (usually required the DS to be shortened as well)
TKO 500 - replacement for the 3350,  input shaft is an 10 spline and output shaft is a 31 spline so you are back to changing the yolk on the DS
TKO 600 - basically the replacement for the original TKO but shifts much nicer, input shaft is an 26 spline and output shaft is a 31 spline so its a different clutch and yolk

Darren

I have a tremec 3550 in my cougar behind my 408w,  with a mcleod steal bell housing.  If I was buying now it would probably be tremec TKO 600 which is the replacement for the tremec 3550,  good up to 600 lb/ft..

here's a link with some specs:http://www.americanmuscle.com/frpp-tremec-tko-600.html