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Thread: 94 gmc 4x4 half ton rear end noise

  1. #1
    Junior Member
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    94 gmc 4x4 half ton rear end noise

    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. #2
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    Sounds like you might have a cracked flywheel(flexplate).

  3. #3
    Senior Moderator chevychase's Avatar
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    Check all good sound travels in the drive train could be a flex plate like JP said.

  4. #4
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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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