Re: Allison 6 Speed GMC 401
Cummins engines are very heavy and the 6 cylinder doesn't fit. The 4BT fits. HP and torque are not all that impressive though. You are right though on reliability. Bus has 70 year old and 50 year old components throughout. Its the reason it sits in the warehouse. Needs late model updates. Reliability with the Duramax /Allison is excellent and servicing it would be pretty conventional.
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