Requesting assistance *GTP 3800 GM crew*

hahaha, i was planin on saving somewhere between 3-5 grand, I might be pickin up one of the guys heres GTPs i dont know the year off hand, its up in this thread somewhere, and so is his SN that i cant remember. he wants 4k for it. but i need more details, its already S/C and has some mods done to it, so i can sort of get it to where i want to more easily. I want a Good deal of power, but i dont want to eat a tranny every 3 months. according to some people theres a fine line on that. Do you or anyone know the maximum safe horsepower on these trannys?