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09-16-2022, 07:16 PM | #18 |
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Join Date: Oct 2008
Location: Wentworth, NH
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Re: Duramax/Allison downshift?
With the engine running put the transmission in Neutral and the transfer case in 2HI.
There are white lines on the RH side of the transfer case shift buttons connecting 2HI, N, & 4LO. Press and hold 2HI & 4LO for 10 seconds or thereabouts. The transfer case will shift into neutral and the red N lamp will light indicating it's in Neutral.
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