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Thread: bad shimmy at 65 mph?

  1. #1
    Join Date
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    bad shimmy at 65 mph?

    The weights are still on all my wheels but i have a horrilbe shimmy in my steering wheel and whole truck at about 65 mph.. and sometimes at low speeds my steering wheel will shake a little.. Reminds me of my big tire days but no big tires this time..? no mud in wheels.. seems like maybe something with rotors in front it kinda jumps when stopping
    07 sierra 5.3
    Remington edition
    Afe CAI closed box
    SLP Cat-back (stainless)
    20in HD hoss black and chrome

    78 Chevy longwheelbase,350,holley 600cfm,6inch lift
    35'' swampers. 87 bed,fuel tank,doors.

  2. #2
    Join Date
    Sep 2005
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    Austin Tx.
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    13,138
    Mine does this too.. my tires are balanced, but i think the rears might be out of round. I let some air out of the rear tires and it calmed down pretty good
    1951 3100
    1984 C10

  3. #3
    Join Date
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    ill check that out... it seems to have got bad after i rotated them..
    07 sierra 5.3
    Remington edition
    Afe CAI closed box
    SLP Cat-back (stainless)
    20in HD hoss black and chrome

    78 Chevy longwheelbase,350,holley 600cfm,6inch lift
    35'' swampers. 87 bed,fuel tank,doors.

  4. #4
    Join Date
    Feb 2010
    Location
    Central Texas
    Posts
    300
    bad tire, out of balance, slack in steering compnent, or maybe even a warped rotor even if you don't feel pulsing in the brake pedal. Good luck

    BB

  5. #5
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    Austin Tx.
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    13,138
    If you just got them rotated they might have too much air pressure in them, which is what caused mine to vibrate like hell
    1951 3100
    1984 C10

  6. #6
    Join Date
    Nov 2007
    Location
    Pittsburgh, PA
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    have you had alignment done lately?
    2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
    2002 Silverado - 427Lsx w/ Twin gt4202s
    2010 Silverado crewcab Z71 - 5.3litre w/ procharger
    2000 Wrangler - 5.3litre with some stance
    2014 Xsport- 3.5 Eco boost
    412 Motorsports

    it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference

  7. #7
    Join Date
    Oct 2008
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    no alignment done since i bought it about 6 months ago.. i am offroad quite a bit... but dont know how that would make it shake ... it doesnt really pull either way
    07 sierra 5.3
    Remington edition
    Afe CAI closed box
    SLP Cat-back (stainless)
    20in HD hoss black and chrome

    78 Chevy longwheelbase,350,holley 600cfm,6inch lift
    35'' swampers. 87 bed,fuel tank,doors.

  8. #8
    Join Date
    Nov 2007
    Location
    Pittsburgh, PA
    Posts
    3,581
    Quote Originally Posted by chadt256 View Post
    no alignment done since i bought it about 6 months ago.. i am offroad quite a bit... but dont know how that would make it shake ... it doesnt really pull either way
    you could of smacked your driveshaft and bent it could have bad tire or rim

    if all 4 tires are properly balanced then i would check for wobbles in the axles
    2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
    2002 Silverado - 427Lsx w/ Twin gt4202s
    2010 Silverado crewcab Z71 - 5.3litre w/ procharger
    2000 Wrangler - 5.3litre with some stance
    2014 Xsport- 3.5 Eco boost
    412 Motorsports

    it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference

  9. #9
    Join Date
    Oct 2008
    Location
    Crimson Tide
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    its in the front end somewhere along the line.. steering shakes just enough to get on your nerves.. feels like unbalanced tires.. but they just got balanced when i put new wheels on 2 weeks ago.. When i brake it does the shaking more often.. like under 20mph.. .......fml
    07 sierra 5.3
    Remington edition
    Afe CAI closed box
    SLP Cat-back (stainless)
    20in HD hoss black and chrome

    78 Chevy longwheelbase,350,holley 600cfm,6inch lift
    35'' swampers. 87 bed,fuel tank,doors.

  10. #10
    Join Date
    Oct 2008
    Location
    Crimson Tide
    Posts
    168
    ok.. i took my truck in for alignment and balance. solved the shimmy problem... but the pulsing and bounce at low speeds he says because the back break shoes are wore compltley out.. It only has 54,000???
    07 sierra 5.3
    Remington edition
    Afe CAI closed box
    SLP Cat-back (stainless)
    20in HD hoss black and chrome

    78 Chevy longwheelbase,350,holley 600cfm,6inch lift
    35'' swampers. 87 bed,fuel tank,doors.

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