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Rear end jumps

Discussion in 'The Garage' started by 84CUCV, Apr 8, 2005.

  1. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    My friends K5 has stock 10b and 35" tiers. Out of no where it started to jump when he got on or off the gas, what could that be?? I have no clue.

    thx Mike
     
  2. txfiremank5

    txfiremank5 1/2 ton status

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    What do you mean by "it started to jump"? Is the rear axle housing rotating upward when he gets on the gas?
     
  3. primr87

    primr87 Registered Member

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    if its got 4" blocks in the rear he may have bad axle wrap causing the u-joint to bind
     
  4. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    2" block. This is how he put it to me. When he hits it or lets off the whole truck just jumps. I dont know how else to put it. I do see what you mean about the block. I see how that could do it, but would it do that with just 2"?? When i see him i will get a better description. Mike
     
  5. primr87

    primr87 Registered Member

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    try watching the rear pinion while he pulls back and forth so you can get an idea of whats happening. mine used to bind when i got on the brakes to hard
     
  6. CHEVY 4WD

    CHEVY 4WD 1/2 ton status

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    Check and make sure the u-bolts are good and tight... I dont really think the bock is causing a problem... Im running a 4in block ( :( ) and a locker right now but i still dont have any problems with wheel hop or anything(I do have AT's which dont grab that hard offroad but ive done quite a few stand still burnouts and I dont get anythere either)
     
  7. BIG STEVE

    BIG STEVE Registered Member

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    Check out the rear mount under the transfer case it lets the rear jump up puting the drive shafts upper ujoint in one hell of a bind thats what happend to mine any way when i went to gmc to get one they had 15 in stock
    that means they sell alot of them put a jack under it it hard to see if its bad just looking at it.

    90 jimmy
    02 gmc HD
     
  8. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    Cool thanks guys i will give it a try. Mike
     

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