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  • VIBES!Low RPM acellerating and above 45mph!

    Well i replaced the poly tranny mount and ever since then its been vibe city. i cant think of what it is now. Ujoints are all fine, Tires are all perfectly balanced, new tranny mount.
    It seems the old mount was so sloppy it musta been sucking up these vibes.
    Anybody got a clue what it might be?
    93 YJ 4" Susp, 1"T-case drop
    -Nick-

  • #2
    You should be fine, the speed limit at the mall is only 5 mph. :t :P :lol:

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    • #3
      In all seriousness if you can get it up here we can get the "team" on it. Just a side note, when I put the MORE lifted motor mounts in they vibrated like a bed in a cheap hotel. Do YJ's have bolts that go through the t-case skid? Did you tighted them?

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      • #4
        I tightened the bolts down yes. i have my lifted mounts sitting int he basement and my 1" BL too, but i know its gonna take prolly 3-4days to do the BL, all my mounts are rusty as crap.

        Still vibin....Cant figure it out.

        Pinion and Tcase end both measured 7degrees if that helps.

        -Nick-

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        • #5
          Is your drive line the right length? Did you have a custom one made when the lift was but on? Did you do the slip yoke elm. kit? With the new tranny mount it could be that the tranny is being held done now which could have shorted or limited the amount of play the tranny had/has so now the driveline being to long is showing up?

          Just my 2 pennies

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          • #6
            stock driveshaft still and no slip yoke, just a Tcase drop. both of them measure out at 7degrees, which means they are parrallel. i cant think of what it could be, seems to be getting worse. my newest guess is maybe pinion bearings, but i think that it would be a constant vibe with those.
            -Nick-

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            • #7
              My Tj had a similar problem after I put the t-case drop on it. Turned out to be a bad u-joint {even though it only had 12000 miles on it}. Good Luck

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              • #8
                I think Boxboy hit the nail on the head. When I did my 2" lift and installed the T-case drop the result was the drive shaft became pinched between the rear end and transfer case. Mucho vibration.

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                • #9
                  Found the problem and fixed it, turned out to be bad pinion bearings.
                  -Nick-

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