how much horsepower can the 904 take?

I had a rebuilt 904 last me 15 months and it was wiped out, got it rebuilt again and got 8 months. Then I found a different trans shop, lol

Straight factory they were not so beefie, 6000--6500 isn't no biggie from a SBM, if the motor can rev and has some power and you drive it hard all the time, well good luck if its all stock or a cheap rebuild