94 gmc 4x4 half ton rear end noise

Discussion in 'GMC Truck Forum' started by brownfirehawk, Jan 29, 2011.

  1. brownfirehawk

    brownfirehawk Member

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    Ok my truck is making a tinny nocking noise on decelration and under light throttle. It also seems to coincide with the trans downshifting so it does it at about 55-60,35-40,25-30. i have replaced the rear u joint and changed the rear end lube and added the friction modifiers as it is a limited slip. Any ideas
     
  2. gpmorgan

    gpmorgan Auto Banned

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    Sounds like you might have a cracked flywheel(flexplate).
     
  3. chevychase

    chevychase Senior Moderator Staff Member

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    Check all good sound travels in the drive train could be a flex plate like JP said.
     
  4. brownfirehawk

    brownfirehawk Member

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    Yea well i popped the diff cover and to my cringing eyes the pinion gear is missin a few teeth and the ring gear has a few chipped. Its a ******* trying to find a 3:73 rear end in lower michigan....
     

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