I destroyed my t-5 tranni and replaced it with a tko600. will my car actually run a bit slower with the tko because of the larger, heavier internals or shouldn't there really be a difference???

 

Have you actually run it at a track before and after, with the exact same staging, 60', track and weather conditions?

 

noyou wont notice adifference, actually it might be a little quicker depending on what gear ratios you got in the trans

 

i never ran it at the track, here are the gear ratios if it helps:

Factory T-5 gears for my 95 GT 1st-3.35
2nd-1.99
3rd-1.33
4th-1.00
5th-.68

TKO 600 gears1st-2.87
2nd-1.89
3rd-1.28
4th-1.00
5th-.64

 

There's your answer right there. The TKO 600 has wider spaced gear ratios (or "taller" gears) overall so just swapping the trans without modifying the car will make asomewhat of a difference. Whether you are actually slower or not depends on where your powerband is and your rear end, etc... If your car is mostly stock I would venture to guess that it may be slightly slower but I can't say for sure or byhow much.

 

That TKO 600 is designed to work better with more gear in the diff.