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Bangs going into 4wd

1K views 6 replies 4 participants last post by  B&B 
#1 ·
I have a 2001 Silverado 3500 with the Allison behind the 8.1 with push button 4wd.
Except when at dead stop, shifting into 4H, the front engages with a loud bag, and also makes significant noise when coming out of 4h to 2h. It engages, I have 4wd. At dead stop, you hear the whiiirrrr of mechanisms working.

Any suggestions as what to look for, where to start? I'm sure this is not OK, I have other GMs and have had GMs over the years without this issue.
 
#5 ·
I guess I am sensitive to mechanical noises, it does not seem right to me. If I had heard the noise for anythign else except going into 4wd, I would have the truck at the stealership. It never sounds good.
I would think I could be moving slightly and shift into 4H, as I do with other vehicles, with no troubles.
It is best to be at a full stop with this truck.
 
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