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  • Rotated Tires - Now Bad Vibe

    About 6 months ago I had my gears done and put my 31's on. Immediately got a professional alignment, no vibes whatsover. Over the last couple months I've encountered a very quick side-to-side shake going over railroad tracks or a bad pot hole ~50mph. Ride on pavement was very smooth however a few days ago I rotated my tires, and re-adjusted PSI accordingly (I run 34 front, 30 rear). Now I have a horrible vibe on normal pavement between 50-65. It mostly smooths out over 70...Shakes my empty passenger seat quite violently and my tranny shifter bounces all over the place. My Jeep has 120k on it now, I think it might be time for ball-joints...Any ideas ?

  • #2
    More than likely a tire is out of balance and when you rotated it, it caused you to be more aware of something worn (tires do loose weights). You can either crawl under and check everything out yourself or have your alignment shop check it for you.

    So I'd say you are on the right track.

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    • #3
      Sounds like when you got your tires mounted, they probably had a problem balancing one of the back tires, so they put them on the back so the mis balance would not be as noticeable. Now that it's up front, you can notice it alot more. Switch the tires back to where they were, and see if it gets rid of it.

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      • #4
        like they said, quite possible a balance issue. out of balance tires are more noticable on the front than the rear. one other possibility is that you didnt get the rim on tight or there is corrosion or rust build up where it seats and its not on perfectly straight. on my xj with aluminum wheels i always have to use an air grinder with a cookie to clean up the mating surfaces or i have that problem.

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        • #5
          I'll get'em balanced this holiday, with any luck that will correct the problem. The tires are from tirepackage.com that came balanced and it shouldn't be the rims, they're brand new steel rockcrawlers. On another issue, I need to flush my tranny again even though it's only be 12k since the last change. My nv3550 is starting to sound like it has rocks in it, especially in 5th or going up a hill. Is it possible the fluid lost it's viscosity when my wife burn't up my clutch last month ? That's the only reason I can think of to change my oil, it should be good for quite a while. (I use Redline MTL every 25-30k).

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          • #6
            Originally posted by xj_colt
            About 6 months ago I had my gears done and put my 31's on. Immediately got a professional alignment, no vibes whatsover. Over the last couple months I've encountered a very quick side-to-side shake going over railroad tracks or a bad pot hole ~50mph. Ride on pavement was very smooth however a few days ago I rotated my tires, and re-adjusted PSI accordingly (I run 34 front, 30 rear). Now I have a horrible vibe on normal pavement between 50-65. It mostly smooths out over 70...Shakes my empty passenger seat quite violently and my tranny shifter bounces all over the place. My Jeep has 120k on it now, I think it might be time for ball-joints...Any ideas ?
            1983 FSM info re Front Wheel Shimmy caused by: loose front wheel bearings;worn,out of balance or out of round tires;loose steering damper worn or loose tie rods;worn,loose or incorrectly preloaded steering knuckle ball studs;"incorrect tire inflation".Try inflating your tires the same front and rear my jeep gets the same pressure front and rear and I have no problem with shimmy unless they aren't balanced correctly or are out of round.
            Last edited by scr83jp; 11-22-2006, 09:37 PM.

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