Allison 6sp: 2006 duramax

monkeyone

New member
Mar 22, 2010
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Hi,monkeyone here, i have a 2006 duramax with allison that will not engage in the morning have run it thru the gears to get it to engage then it is alright
the rest of the day, i am thinking it is a check valve letting fluild drain from
converter over nite, as had seen something about a check somewhere in the
trans.
I thought it was at the converter or in it,thank's