I have an 88 firebird that I have an 402 chevy big block with a procharger pushing about 900 horse and 609 pounds of torque I have seen and heard of some guys running low tens with t5s I thought about a t56 but hell if I can keep it a t5 then why not does any body know of any after market parts that can beef it up so it can stand some late night fun

T56 and dont look back...

I already had one in there snapped turned it into scrape with a stage three clutch and lakewood bell housing

LOL, you did that and want to know if a T5 can do better? LULZ.

Man, a T56 has gone 8s over and over with the mods dont to it. That is what you need to do.

Doesn't matter about time in the quaurter, neither the t56 or t-5 will hold up to 900hp in any form. I this is gonna be a straight racer look into a Lenco Trans, or if it is gonna see the street shy a way from a lenco and look into the aftermarket i'm sure you could find something to hold up that kind of power. But there is no way a T5 of T56 will hold up to that kind of power.

I've broke about 6 of the T5s with my little V6.

Check into a Tremec TKO-600 or a Richmond Super Street 5-speed . Both can handle the 600 # of torque you have . The Richmond has two versions 1- 3.33 first or 2-2.89 first and both have a 1.85 2nd , 1.31 3rd , 1.1 4th , and .77 od . The TKO-600 also has two versions 1st 2.87 , 2nd 1.89 , 3rd 1.28 , 4th 1.00 , and 5th .64 or .82 . The prices from JEGS is $2,195.99 for the TKO-600 or $3,503.99 for the Richmond Super Street .

x2

I've built T56s that are holding up to those power levels without problems.

Wrong, a T56 can be made to handle 1200 HP.