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Vibration Help

Discussion in 'The Garage' started by Mule man, Aug 7, 2005.

  1. Mule man

    Mule man Registered Member

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    I have a '79 K-20 with the 465/205 combination. I have dealt with a slight vibration for 2 years. It developed and is not the result of a crash. I can jack the rear off the ground and the drivers side rear wheel hops up and down. I have gone from the 2 piece driveshaft to a 1 piece that was balanced and has new U joints. I installed a 2" lift a few years ago that has the blocks for the back. They are tapered to give a better driveline angle. I have dropped the tranny/transfer case so that the transfer case is pointing straight at the rear pinion. I have tried new tires and rims and there was no change. The wheel hop is only on the drivers side. Could a bent axle tube cause a speed specific virbration? Sorry for the long post but I am close to the end of my rope. Any help, opinion or advice will be greatly appreciated. I know this is not a K5 but this seems to be the forum with the greatest number of people who actually know what they are talking about.
     
  2. down4thakrown

    down4thakrown 1/2 ton status Premium Member GMOTM Winner

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    if you got a full floater rear end.you can tell if you have the 8 bolts in the center of your rim . your rear hub bearings are shot and need to be replaced. is there alot of gear oil leaking from that same tire that hops?
     
  3. Leper

    Leper 1/2 ton status

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    Is any oil leaking from the shock on that side?
     
  4. Mule man

    Mule man Registered Member

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    Thanks for the replies. There is no oil leaking from the shock. I have replaced the wheel bearing and seal. The old bearing was still tight. It's a 14 bolt full floater axle. Vibration begins about 53 and becomes less obvious about 65. I have swapped different tires and rims. No change. I have BF Goodrich 265-75R16's on the truck. Nothing radical. It seems to be worse when pulling a load (6,000-8,000 lbs.) Thanks again.
     

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