How much beating will my trans take?
Since you're using a T56, I'd be more worried about the rear giving out before the trans takes a dump because of too much power.
Staying off slicks will also reduce the possibility of breaking either rear or trans.

I've got ~20k on my car, 400 rwhp, 3400 stall, no problems. But it does have a TransGo HD2 shift kit and a cooler. The shift kit was required b/c it was slipping before.



