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Thread: 1990 GMC 4x4 VIOLENT front end shake at 45-60mph

  1. #1
    mr.joshq
    Guest mr.joshq's Avatar

    Default 1990 GMC 4x4 VIOLENT front end shake at 45-60mph

    I just acquired a 1990 GMC 1500 4x4 extended cab long box a week or so
    ago. The previous owner said it had a VERY violent shake in the front
    end that would start at 45mph and stop at 65mph. His mechanic looked
    at the front end and couldn't find anything wrong... He was unable to
    try to balance the tires as he didn't have a balancer big enough for
    the 16 inch rims... but gave him a set of rims and used tires to try
    on the front.

    He didn't get a chance to swap them before he got a new truck and
    parked this one. Before I drove the truck I swapped the fronts. I
    didnt have the shudder on the way home. I had the old fronts balanced
    and put them back on. I drove it for a few days with no problems
    other than a slight vibration from the rear(havnent balanced those
    yet, will do in a day or so).

    Yesterday I drove at highways speed for about 20 minutes, I
    decelerated off the off ramp and then back up to highway, I hit 45 and
    there it went BANG BANG BANG BANG... .... near shook the doors off.

    I parked, went to the place I was going, got in and drove off. Same
    road, same speed. No issue.

    It seems to be somewhat intermittent. I'm thinking it could be the
    stearing box as the stearing is loose. The ball joints, etc look
    good. I just redid the brakes, oil, transmission fluid, plugs,
    etc...

    The only other thing I can think of is a belt slipping or blister in
    the tires.

    Any ideas?

    Thanks
    JOsh

  2. #2
    Martin Riddle
    Guest Martin Riddle's Avatar

    Default 1990 GMC 4x4 VIOLENT front end shake at 45-60mph

    Its neat to watch from the outside too

    What size tires?
    Do you have a steering stabilizer?

    Cheers

    <mr.joshq@..........> wrote in message
    news:1179504905.443641.87910@k79g2000hse.......... ...........
    >I just acquired a 1990 GMC 1500 4x4 extended cab long box a week or so
    > ago. The previous owner said it had a VERY violent shake in the front
    > end that would start at 45mph and stop at 65mph. His mechanic looked
    > at the front end and couldn't find anything wrong... He was unable to
    > try to balance the tires as he didn't have a balancer big enough for
    > the 16 inch rims... but gave him a set of rims and used tires to try
    > on the front.
    >
    > He didn't get a chance to swap them before he got a new truck and
    > parked this one. Before I drove the truck I swapped the fronts. I
    > didn't have the shudder on the way home. I had the old fronts balanced
    > and put them back on. I drove it for a few days with no problems
    > other than a slight vibration from the rear(havnent balanced those
    > yet, will do in a day or so).
    >
    > Yesterday I drove at highways speed for about 20 minutes, I
    > decelerated off the off ramp and then back up to highway, I hit 45 and
    > there it went BANG BANG BANG BANG... .... near shook the doors off.
    >
    > I parked, went to the place I was going, got in and drove off. Same
    > road, same speed. No issue.
    >
    > It seems to be somewhat intermittent. I'm thinking it could be the
    > stearing box as the stearing is loose. The ball joints, etc look
    > good. I just redid the brakes, oil, transmission fluid, plugs,
    > etc...
    >
    > The only other thing I can think of is a belt slipping or blister in
    > the tires.
    >
    > Any ideas?
    >
    > Thanks
    > JOsh
    >
    >

  3. #3
    smoove
    Guest smoove's Avatar

    Default 1990 GMC 4x4 VIOLENT front end shake at 45-60mph

    I had a problem like that on my 95 suburban. turns out that the control arm
    bushings needed to be replaced.

    <mr.joshq@..........> wrote in message
    news:1179504905.443641.87910@k79g2000hse.......... ...........
    >I just acquired a 1990 GMC 1500 4x4 extended cab long box a week or so
    > ago. The previous owner said it had a VERY violent shake in the front
    > end that would start at 45mph and stop at 65mph. His mechanic looked
    > at the front end and couldn't find anything wrong... He was unable to
    > try to balance the tires as he didn't have a balancer big enough for
    > the 16 inch rims... but gave him a set of rims and used tires to try
    > on the front.
    >
    > He didn't get a chance to swap them before he got a new truck and
    > parked this one. Before I drove the truck I swapped the fronts. I
    > didn't have the shudder on the way home. I had the old fronts balanced
    > and put them back on. I drove it for a few days with no problems
    > other than a slight vibration from the rear(havnent balanced those
    > yet, will do in a day or so).
    >
    > Yesterday I drove at highways speed for about 20 minutes, I
    > decelerated off the off ramp and then back up to highway, I hit 45 and
    > there it went BANG BANG BANG BANG... .... near shook the doors off.
    >
    > I parked, went to the place I was going, got in and drove off. Same
    > road, same speed. No issue.
    >
    > It seems to be somewhat intermittent. I'm thinking it could be the
    > stearing box as the stearing is loose. The ball joints, etc look
    > good. I just redid the brakes, oil, transmission fluid, plugs,
    > etc...
    >
    > The only other thing I can think of is a belt slipping or blister in
    > the tires.
    >
    > Any ideas?
    >
    > Thanks
    > JOsh
    >

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