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driveline clunk noise?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Mudfreak, Jan 19, 2001.

  1. Mudfreak

    Mudfreak 1/2 ton status

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    My 88 k5 has had a driveline clunk noise for some time now. I can't seem to figure it out. It happens when I accelerate from a stop position. I can feel it through the floor underneath my feat. I thought it was the wheel bearings coming loos or something easy like that, but it's not. Iwas also thinking it could be the t-case bearings, haven't check yet. Any thoughts or suggestions are appreciated. Thanks.
     
  2. Blue85

    Blue85 Troll Premium Member

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    It could be the transfer case mount. There is a rubber isolator that bolts to the frame crossmember and to the T-case. Sometimes after being soaked in engine oil and ATF for more than a decade, they decide to break up. I've also seen the bolts come out. It's possible that the torque in the rear drive shaft is lifting the T-case off of the cross-member a little bit, and maybe even hitting the floor. It's easy enough to check out, anyway...

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  3. ftn96

    ftn96 1/2 ton status

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    Thats my guess. I had the same problem when I first bought my Jimmy. The rubber had seperated from the mount, allowing it to bang around in there under initial load. But the driverside motor mount was also broken too. REplaced the both of them and whaalaah..

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  4. Depdog

    Depdog 1/2 ton status Author

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    Sounds to me like the classic bad u joint.

    Depdog

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  5. Mudfreak

    Mudfreak 1/2 ton status

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    Never thought about the t-case mounts. Thanks for the info.
    will have to look into it.
     
  6. BurbinOR

    BurbinOR 3/4 ton status

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    Had the same problem on my 79 and got the polyurethane mounts from OffRoaddesign.............the problem is 90% gone, there is still some slop in the drivetrain somewhere, but what a difference! LIke someone tightened up the whole truck.

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  7. thatK30guy

    thatK30guy 1 ton status Premium Member

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    I had an 81 short bed with 4" lift once and the damn thing would go through a u-joint about every month or so. Problem was the short wheel base and angles of shaft. I knew that clunking was from bad joints. It happened when I shifted between gears and stop and go motions. I even blew one once and luckily didnt mess up the shaft. Put your truck in neutral and get down and grab the shaft. Twist it around and if it moves alot and makes the clunk noise, then your problem is obvious.
     

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