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Re: 2003 GMC 2500HD 6.6 and Allison falls out of 5th
Posted to Transmission Forum on 1/23/2018 2 Replies

I had one of these once that didnt exhibit all the symptoms you have but had the gear ratio code you have. The tranny guy around here fixed it by replacing the bushing in the transfer case. Apparently when the bushing wears the tone ring for the vss created in... Login to read more.

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