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  1. #1
    Join Date
    Aug 2006
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    YJ Vibration after Lift

    I just helped a buddy put a 4" Rough Country lift on his '93 YJ. We installed new shocks, leaf springs, drop pitman arm, and 1" transmission drop.

    When we drove it, he noticed an unusual vibration. The only thing we can figure out is that the driver side motor mount is shifted all the way to the rear and the bracket is touching the frame connector.

    Another thing we see is that the shifter seems to be a little hard to get into 2nd and 4th.

    1. Does it sound like a motor mount gone bad?
    2. How do you guys adjust the shifter to get into the lower gears easier?

    I will try to get some pictures of the motor mount this afternoon.

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  3. #2
    Ben E's Avatar
    Ben E is offline "Flopped Club/Roll Over Club" / JOTM - December 2009 LSJC Member
    Join Date
    Oct 2006
    Location
    Murfreesboro Arkansas
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    Is the vibration the speed of the engine, drive shaft, or the tires?

  4. #3
    Rblue Guest

    virb's

    CHECK YOU PINION ANGLE.:help:
    I just bet it has changed.
    Did you add wage's to your rear diff spring perch's.
    I had to add angle wage's on my 3"lift.

    It's easy to fix.:welder:

    Good luck
    from cris

    93YJ 2" body-3"spring

  5. #4
    ZANIAC Guest
    Pinneke is most likely on track...he will probably have to use shims on the rear springs to correct the pinion angle...dropping the transmission most likely is causing the driveshaft vibration

  6. #5
    Join Date
    Aug 2006
    Location
    The Colony
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    The rear springs came with wedges installed.

    I think the vibe is coming from the engine. Sorry I don't have pictures. I will try to explain.

    The MM is a u shape with a rod going through the center from front to back. This rod attaches to two pieces of steel that are connected to the engine. The front engine connection bracket is up against the MM very tight. The rear engine connector is very far away from the MM. Normally, I thought the rod is centered in the MM.

    Still working on the pictures though. Just need to get over to his house and snap a few.

  7. #6
    Join Date
    Jun 2007
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    Somewhere in Kaufman County
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    1,863
    Quote Originally Posted by zilla View Post
    Pinneke is most likely on track...he will probably have to use shims on the rear springs to correct the pinion angle...dropping the transmission most likely is causing the driveshaft vibration
    :yes:

  8. #7
    Join Date
    Aug 2006
    Location
    The Colony
    Posts
    1,678
    Thanks for the advice guys.

    The MM was changed and the vibrations stopped.

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