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Re: 2006 C5500 Duramax LLY engine swap?
Posted to HD/Fleet Forum on 3/18/2019 1 Reply

We now have definitive answers for engine and transmission. Sort of....

Transmission = all Allison 1000HDR series transmissions are actually 6 speed and PTO capable. Not all have PTO gear installed. You can remove side cover(s) and check. Will have tone ring... Login to read more.

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