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thanks big hurt, OD would be great, any allisons bigger than 5 speeds are so huge though

I'm not scared about breaking the 654 Allison, just the gears is my dilemma. I know two things to be facts, my buddys have mud trucks 1. The first truck has a 700-750HP 12v cummins with a stock Allison 545 behind it ran two seasons no problems. 2. The second truck has a 07 Duramax with basically...

Have a chance to get a nice rebuilt Cummins 400 Big Cam III, im just wondering if the gearing/power combo will be affected if i kept the 654 allison, it being a five-speed I dont want to "run out of gear", and prompt higher RPM's. Hence the cummins 400 came in 915's with those cat transmissions...