I had a problem with my gmc. But it was 4wd I tried putting it in 4wd one day and it wouldn't engage. So I just put it back in 2wd put in reverse to leave and when I put in forward it wouldn't go anywheres. So I just started pushing buttons and gas finally a big knock then It was in gear. On the way home it disengaged again so I pulled over bout the time I stopped it engaged again. So when I got home I tried just to leave it in auto4wd mode and for some reason it ran better like that. Never brought it to the shop but some one was telling me it sounded like the shift motor was out. I'm not sure if the 2wd have a shift motor?
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