I am currently looking at school buses for a future project, and I have found a few of them with the good ole 5.9 Cummins and an Allison (Mostly 545) tranny in them. How much power can I put to the transmission before I need to worry about grenading it?

 

well they say that the allison 1000 is capable of 1000 lbft of torque in its stock configuration.

 

an at545 is not recommended for high horespower apps, i kinda remember a stock 545 only being rated for 250 horse max.