Mr.Stang08

I was just wondering and had the couriosity... If our transmission is rated to 360 lbs ot torque, how come Roush left this transmission on the 2008 Roush stage 3. This Roush is rated 400lbs of torque at the flywheel. Let talk about reliability and longebity.
Cause right now I'm doing 400 rwtq kinda scary

PSUSkier

There are a bunch of people running much heavier loads on your transmission than you are... Pretty much any of the HO kits out there put out about 450 rwtq give or take a bit and everything holds up pretty well with the exception of the input shaft. I believe a few people have snapped that with slicks on the track. All in all, I think our transmission has proved to be quite the workhorse.

Mr.Stang08

I agree that makes me wonder how accurate those 360lbs are on the specs

Diabolical!

The 3650 in the S197 is severely underrated. I personally know a guy throwing nearly 600rwtq at it with regular trips to the drag strip and it is surviving.

REDBOSS1

I still believe it's all in how you drive it, beat on it and it will break, have fun every now and then it will hold up for a good while.

Simon1

Im surprise mine has lasted as long as it has.

Riptide

The stock clutch will probably give you trouble before the rest of that transmission will.

andywalls

im at 465rwho 450tq and my tranny and clutch are both good as new with some serious abuse... i dont ever do any burn out or launches which def help but after the car is moving... its fair game in my book.

2005Redfire6

I wouldn't be too concerned with the 360 ft/tq rating mainly because I read somewhere that the stock T5 in the V6 is only rated to roughly 210 ft/tq, the V6's make more then that stock...

Norm Peterson

Transmission torque ratings aren't the same as engine torque output specs, as they are durability ratings rather than a measure of torque developed. Roughly, a tranny torque rating is a torque level at which the tranny is expected to live for some extended length of time and/or number of shifts that the mfr considers acceptable. It is not the torque at which it will immediately break. Kind of like a crankshaft having a torque (strength) rating that is not at all related to whatever the rest of the engine is capable of making.

That gets into a discussion of fatigue, which to make a long story short means that it can stand somewhat higher loads than the rating, but only for a shorter time and fewer occurrences. Or if you always treat it more gently it may last longer than the mfr counts on.

So-called "impact factors" due to suddenly applied loads also need to be considered, meaning that the box won't last as long or as many times under conditions that include much abusive sidestep-the-clutch dragstrip launching and no-lift upshifts than it will under easier clutch engagement.


Norm