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Artum_Snowbird's avatar
Artum_Snowbird
Explorer
Aug 24, 2013

Why do I shake???

I've got an F 350 SRW 4 by 4 Club Cab. I have Vision 81 19.5 wheels on it, and have had two wheel balances in the last month, and still it shakes so much around 40 to 45 miles per hour it is just bouncing up and down. It seems to smooth out after 45 MPH and run fine after that.

I am running empty right now, doesn't seem to make a difference whether it carries the camper or not.

I am thinking, should I revert back to my 16 inch tires to see if the 19.5's make a difference, or should I be looking for something else. This truck is a cream puff, has never been even remotely subjected to rough conditions, the 4 by 4 is used to haul our boat out of boat ramps.

Any tire guys, wheel balancing guys out there with any suggestions to try? Thanks for your help.

mike
Tow Vehicles

24 Replies

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  • BenK's avatar
    BenK
    Explorer
    Aug 24, 2013
    Do you know if the wheels are hub centric, or lug centric?

    My forged alloy 16x10 wheels are lug centric (wanted hub centric, but that
    is all they had back in 1997) and are some times wobbly due to the kid who
    didn't listen to me and spun the lug nuts on with an air gun...his boss denied
    that his worker did that and must be me or a previous shop

    The kid oblonged some of the holes when the lug taper hole wasn't centered and
    the lug nut rode up one side to chew up metal

    The tires could be out of round or just poorly made with too heavy a spot

    You wheel could also be out of round and/or not straight. I've had steel wheels,
    wire wheels and alloy wheels bent by tire gorillas forcing it on their machine

    Other potentials are that it could be in the knuckle/hub/etc and NOT
    the tire/wheel....or some other rotating thing that makes it seem like
    the tire/wheel
  • Artum_Snowbird's avatar
    Artum_Snowbird
    Explorer
    Aug 24, 2013
    The shop I went to has the Road Force Balancer, and they went through the truck today with a great history and are the best in town... I am often wondering whether it might be some strange harmonic... should I try to dry 90 mph and see if it appears as a double?
  • bovellois's avatar
    bovellois
    Explorer
    Aug 24, 2013
    You need to find a shop that uses a the Road Force balancer (by Hunter). It will spot defects that won't show on a regular wheel balancer.
  • Vulcaneer's avatar
    Vulcaneer
    Explorer
    Aug 24, 2013
    The obvious is wheel balance or out of round situation. Either for the rims, the tires, or both. But could be u-joints. But that is less than likely.

    Lots of other possibilities for vibrations.

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