A T-400, even moderately built with a few upgraded parts can withstand tons of power in a heavy ride.
I'm pushing 1600 crank HP through mine (detuned) right now at 3250 + me.
A typical high performance trans is going to run anywhere from 1200 to 1600...
http://transmission-specialties.com/...a5aa608fc39f7a
I just spent 800 on mine getting it freshened up last year.
It would be a good idea to get a T-brake for street or race, simply due to elimination the possibility of it going into reverse with using the t-brake solenoid.