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  1. #1

    Default Transmission problem or other

    Ive noticed a noise lately on my 99 GMC Sierra Z71. Im getting what I would call a clunk noise. Ive noticed it more when I am going around a curve and having to get out of the gas and then getting back into the gas. We noticed it while riding in the sharp twisted steep hills in the Smokies. It doesnt feel like anything is slamming into gear though. Tranny has 112K miles on it but was well maintened by the guy I bought it from. Even has a drain plug in the pan so I am assuming he had at least changed it once. Any ideas on what this could be. Definitely toward the middle to rear of the truck. Thanks

  2. #2

    Default

    Welcome to GMTC. The clunk could be a number of things. Have you crawled under the truck and looked? First check the U Joints for slop. Take a good look at the transmission mount and look for loose or missing bolts. Check the cross member bolts too. Usually clunks do not come from the transmission itself or transfer case. Check the rear spring bolts and the pinion flange while you're under there.
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  3. #3

    Default

    Jimmie, I have gotten under there and looked around a little. How much slop would be noticeable with the ujoints? I dont know much about ujoints. Never had one go bad on any of my vehicles. Would it be something I could move enough by hand to know it was bad? Thanks

  4. #4

    Default

    Quote Originally Posted by scott0303 View Post
    Jimmie, I have gotten under there and looked around a little. How much slop would be noticeable with the ujoints? I dont know much about ujoints. Never had one go bad on any of my vehicles. Would it be something I could move enough by hand to know it was bad? Thanks
    U Joints can be tricky to diagnose. Usually a bad one will show rust or metal around the rubber cups. A bad U Joint may feel good until you jack up the rear end and get the vehicle weight off and the drive shaft free to turn. Also with the truck on the ground look at the U Joints while someone shifts between forward and reverse.

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