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So more surprises when the disassembly happened....radiators shot...tank is really bad core plugged. Bigger surprise is the tranny input shaft is scored hard and case is cracked. Now comes dwcision time. The Tranny is not rated for 350 hp only 300 and Allison 654CR Trannys are unicorns for this application as well as not supported by Allison. Is there a six speed option out there for a 6v92ta? I will hate to lose the retarder also. My Mechanic says a 8.9 or 8.3 Cummins swap is not that big of a deal for him if we get the ecm out of a wrecked motorhome and go w a six speed allison. Any thoughts most helpful community?