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4 wheel drive is not working

Discussion in 'Commercial Snow Removal' started by senor plow, Feb 4, 2001.

  1. senor plow

    senor plow Junior Member
    Messages: 22

    My 1984 full size gmc jimmy is having some problems with its 4 wheel drive. I put it in 4 Hi and I don't think the front tires are getting any power. I put it in 4L and its not any better. Sometimes, if I'm in reverse and I'm spinning out, unless I have my foot real hard on my brake pedal, the back right wheel spins real fast. need help
  2. plowking35

    plowking35 2000 Club Member
    from SE CT
    Messages: 2,923

  3. 66Construction

    66Construction Senior Member
    Messages: 315

    If you have automatic hubs it could be the actuator, it screws into the axel tube somewhere around the front differential. Give it a check.
  4. senor plow

    senor plow Junior Member
    Messages: 22

    4x4 not working

    I have manual locking hubs
  5. plowking35

    plowking35 2000 Club Member
    from SE CT
    Messages: 2,923

    The 84 doesnt have an actuator. Its old school with hubs and t case.
  6. plowjockey

    plowjockey PlowSite.com Sponsor
    Messages: 622

    If they are manual hubs I would get out the allen wrenches and pull them off to see if you have broken a spring or a dog on the lock knob, handle, or whatever they call the thing that you turn.

    Happy Plowing
  7. DanG

    DanG Senior Member
    Messages: 240

    I'd lock the hubs one at a time to make sure they engage & then jack up that side and turn (spin)the wheel.
    If it turns the axle and the driveshaft back to the transfer case it sounds like you might have a bad transfer case.
    If it engages & when you spin the wheel it doesn't turn the driveshaft coming out of the transfer case you could have a bad ring & pinion .
    You might have snapped the chain in it or on some of them they're all gears inside.
    Also,Depending on what axles you have in the truck unless you have a posi,or lockers it would tend to send all the torque to what ever wheel will spin easier.
    So that could be why it seems one tire is spinning more.

  8. NEAL

    NEAL Member
    Messages: 98

    This response may be too late to help you but I know that the transfer cases used in these trucks had a problem of not staying in 4 wheel drive. There is a fork inside with 3 "pads" on it. These pads can wear out and cause it to not stay in 4 wheel drive. It happened to my 87 k-5 blazer. I am not a mechanic but was able to rebuild it myself using a Haynes manual and regular tools.