Transmission Problems

By darter2001
October 12, 2015 in 1988-1999 Chevrolet & GMC C/K GMT400 Platform

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darter2001

Posted October 12, 2015

I was hoping I could get some assistance and direction with a transmission problem. First, it is a 2001 GMC 2500 HD with a duramax and Allison transmission. I first noticed the problem when leaving a parking lot and not quite coming to a complete stop and then accelerating to go. The engine would rev then the transmission would lock up and jerk the entire truck. Also recently I have noticed that when I back up then shift into drive it seems to take longer than normal to engage.

Any ideas?

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