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Help me diagnose this noise

Discussion in 'The Garage' started by djohnsn, Feb 25, 2004.

  1. djohnsn

    djohnsn 1/2 ton status

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    Location:
    Plano, Texas
    Clicking sound at slow speeds
    Above 30 mph becomes a roar (sounds very similar to revving the engine)
    Does not vary with engine speed
    Only happens under load (I can put it in neutral and the noise disappears)


    I suspected a transmission problem at first, but my tach does not show the engine revving more than usual to indicate a slipping transmission (th350). Could it be U-joints or rear end? Any ideas would be appreciated.
     
  2. 99firehawk

    99firehawk 1/2 ton status

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    ID guess rear end, but thats just a guess, its kind of hard to diagnose noises without hearing them, Id definatley check your u joints though.
     
  3. rodriscoll

    rodriscoll Registered Member

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    I think I have the same problem started out as clicking now sounds like valve train tapping but it is not I think it is the transfer case chain I will be checking into it this weekend.
     
  4. Panther

    Panther 1/2 ton status

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    I'm big on narrowing down the problem as much as possible. If it were me, I would pull the rear driveshaft, put it in 4wd and drive it up past 30 MPH. That will tell you if it's your rear axle/driveshaft (based on your statement about load).

    (Also based on that statement) I'm guessing it does not happen at idle?

    If your u-joints are shot, they could be clicking when the shaft flips and the load changes on it.
     
  5. GMCLegacy

    GMCLegacy 1/2 ton status

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    does the clicking noise match your tire rotation? you may have a some bad teeth on your ring gear.
     
  6. djohnsn

    djohnsn 1/2 ton status

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    I would pull the rear driveshaft but since I don't have a usable front driveshaft right now, that probably would not do me much good.

    The noise does not happen at idle.

    I am going to try to make time to replace u-joints this weekend (I am sure that it will not hurt to have new u-joints even if it turns out to be a different problem).

    Thanks for the suggestions.
     

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