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Bangs going into 4wd

Discussion in 'Chevy Trucks' started by sjwrangler, Jan 30, 2010.

  1. sjwrangler

    sjwrangler Member
    Messages: 77

    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.
  2. andcon83

    andcon83 Senior Member
    Messages: 388

    The owners maunal states that there should be a definite clunk when they go in. My 2001 always did.
  3. chcav1218

    chcav1218 Senior Member
    Messages: 954

    my 2000, which i believe is very similiar to your 2001, also makes a pretty loud clunk when it goes in and out of 4wd.
  4. andcon83

    andcon83 Senior Member
    Messages: 388

    What's the saying? Run it 'till it blows?
  5. sjwrangler

    sjwrangler Member
    Messages: 77

    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.
  6. andcon83

    andcon83 Senior Member
    Messages: 388

    A sudden thud or clunk is ok. But it it makes dust rise from the floor, then maybe it should be looked at. Know anyone else with a push button? Maybe have them ride in it and see if it is worse then their's.
  7. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    A clunk as it engages while moving with any speed is normal...