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Re: 2003 GMC 2500HD 6.6 and Allison falls out of 5th
Posted to Transmission Forum on 1/23/2018 1 Reply

Check the fluid level and condition in the transfer case. I have seen the forks worn out so bad that it can force the transfer case range slider into neutral and it will re-engage when you lift your foot to keep driving. The pads for the range fork can be sitt... Login to read more.

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