Quote:
Originally Posted by clay67
I don't know anything about the half ton transmissions but I have a duramax with the allison trans. My Trans Control Module went out causing it to be stuck in 3rd gear and shifting really hard from neutral to reverse or forward but it could cause many different issues. Hopefully it is just a controller and not the whole transmission. Just find a good transmission shop to do your work.
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It is down shifting hard btw 2-1. Sometimes also lags to shift btw 2-3 gear sometime.
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