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My 88 Eagle 15-40 just had a 6v92T installed. I also have the Allison. Supposed to be ready in February.That engine has a good reputation for endurance. It should push a 40 foot bus without a problem. I am in Florida and don't have to contend with any real steep hills. We are replacing (I believe an 8v71??) Not sure. Sorry I'm not much help, but if there is a big difference in power I will definitely notice it.
Keith |