What can a modified t56 take?
 

Hey guys quick question, what can a t56 with bronze fork pads, billet keys, a bronze shifter bushing, and steel forks. what kind of hp would a stock t56 with these upgrades take? Also are they worth doing? please let me know what you guys think.

Should be good for 450 rwhp I think it would need the viper input shaft to really bump it up.

I thought those were the stock numbers anyway? I thought for sure it would be around 500.

500 plus would work its all how you drive it.

I did a google search and didn't find the info I was looking for, but I seem to recall it being rated to 700 at the crank.

Have a look at, or even better call Texas Drivetrain Performance and ask. Good people.

http://www.texasdrivetrainperformance.com/

None of those upgrades does anything to increase the torque capacity of the trans. They really only help with shift quality.
As far as I know the only real torque upgrade for the LT/LS T56's is a mainshaft upgrade. They come with 27 spline outputs stock. You can go to the 30 spline viper mainshaft. A friend who works on GM manuals said there is a T56 that came in SSR truck that has a 32 spline main shaft.

I was advised to just buy a T56 magnum, because it already has all the upgrades.

That was my suggestion, gotta pay to play!

A T56 magnum has a torque rating of 750 ft lb....now that is a "safe" measurement I'm sure it could survive more then that depending on how you drive. Realistically do you need more then that for street use?
I realize that you aren't necessarily talking about a magnum but I'm willing to bet that by the time you get the "regular t56 and then rebuilding it you will have a similar amount of cash as purchasing a magnum in to it. Plus a magnum would be brand new not rebuilt and carry a warranty that wouldn't be as limited as one on a rebuilt tranny. It takes a bit to get to where you need to be....keep saving, I had to and, scored my self a magnum and a quicktime bell housing

I don't see how even a 30 or 32 spline makes the transmission stronger. The input shaft is still 1-1/8" and 26 splines. Youre only as strong as your weakest link. You will bust teeth off the gears before you shear a input or main shaft. The T56 Magnum's strength over OEM transmissions is mainly the gears.


Edit....I found this http://www.moderndriveline.com/Techn...s_improved.htm

Typically when you increase the spline count you will increase the contact area. Think of a 4000 lb car on 4 275 tires verses 4 205 tires...which one has more contact area to apply to the pavement. I know not the best example but you get the idea. Now having said that the magnum uses a much beefier shaft and larger gear face while still using the way more popular 26 spline input shaft. Allowing the aftermarket to continue with their current product lineups