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Old 09-17-2022, 09:40 PM   #19
1976gmc20
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Join Date: May 2015
Location: Montana
Posts: 3,696
Re: Duramax/Allison downshift?

Quote:
Originally Posted by hatzie View Post
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.
Thanks!

Sounds like her insurance may pay for towing it over the mountains to her home area and mechanic. After all this the shop there in that little town where she stopped can't find anything wrong with it.
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Current/past Chevy/GMC trucks:
1958 Chevy C-60; 1965 GMC C-50; 1965 Chevy C-10; 1971 Chevy K-10; 1973 Chevy K-20; 1976 GMC C-20; 1977 Chevy C-10 Suburban; 1980 Chevy K-10; 1989 Chevy K1500; 1991 GMC V1500 Suburban; 2016 Chevy K2500 HD

Other vehicles: 1988 Jeep XJ; 2011 Toyota 4Runner
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