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Driveline noise ?

Discussion in 'The Garage' started by kick, Jul 17, 2004.

  1. kick

    kick 1/2 ton status

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    My 1990 V10 Blazer with 700R4 has a noise coming from the extension case front u-joint area on the rear driveshaft. It seemed to be the u-joint so I replaced both on the rear driveshaft. The problem still exists on medium to quick starts in both drive and reverse. It does not happen all the time. I will check the splines on the output and input shafts again as they seemed fine. It seems like something is under pressure. The truck runs fine there is no vibration. When this noise occurs from a dead stop it seems to be mid truck more to the passenger side. Any ideas what this could be ? Thanks Charlie
     
  2. ugly_blazer

    ugly_blazer 1/2 ton status

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    What does the noise sound like? Does it change as you speed up or slow down?
     
  3. kick

    kick 1/2 ton status

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    The sound just happens once either in Drive or Reverse. It does not happen all the time. Only from a dead stop.
     
  4. ugly_blazer

    ugly_blazer 1/2 ton status

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    Is it a "clunk" noise? Only happens once when you put it in gear?
     
  5. backcountry

    backcountry 1/2 ton status

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    Have you recently done any recent modifications?

    Check your u-bolts and make sure they are torqued to spec.

    /forums/images/graemlins/peace.gif
     
  6. kick

    kick 1/2 ton status

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    No it is stock the bolt a torqued correctly. I'm thinking its got something to do with the output shaft.
     
  7. kick

    kick 1/2 ton status

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    No the noise only happens on takeoff. I can go back and forth to Drive and Reverse with my foot on the brake and reving the motor with no driveline noise. This is a strange one.
     
  8. ugly_blazer

    ugly_blazer 1/2 ton status

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    /forums/images/graemlins/dunno.gif
     
  9. big jimmy 91

    big jimmy 91 1/2 ton status

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    Is it a single clunk?
    I have it on my truck also but it goes bang bang bang repeatedly until you are moving
    It is the t case hitting the floor pan due to a broken torsion bar from the motor to t case and weak mounts
    Mabey that is happening with your truck /forums/images/graemlins/thinking.gif
     
  10. kick

    kick 1/2 ton status

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    Yes that sounds good. I will check the mount it seems ok but it is OE and 15 years old. But it maybe bad as I can only apply so much force lying on my back. Thanks I will check it tomorrow,
     
  11. kick

    kick 1/2 ton status

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    It was a transmission mount starting to go. Thanks all
     

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