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Gears installed... vibration, where to look?

This is a discussion on Gears installed... vibration, where to look? within the Drivetrain forums, part of the LSx Technical Help Section category; I installed my 3.90s and everything looked good... backlash .007 (and within 0.002 all around the ring). Pattern good, centered ...

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    Member 666ws6's Avatar
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    Gears installed... vibration, where to look?

    I installed my 3.90s and everything looked good... backlash .007 (and within 0.002 all around the ring). Pattern good, centered on the tooth and little toward the heel.

    There's a small amount of whine but only a little beyond stock gears.

    Problem is there is a vibration at 40 mph and up. Feels like a rotational vibration. At higher speeds, more like a high frequency thudding.

    Any thoughts on what I should check? My thoughts lead toward driveshaft or how tightly I have the differential shimmed. I did change the u-joint on the DS at the rear too.

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    RE: Vibration

    If you changed your rear u-joint, the driveshaft may be out of balance - you should have it checked and re-balanced.

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    I was thinking the same thing, so I flipped the DS 180 to see any change in the vibration .... and it fixed it.... vibration gone! Smooth as ever!

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    Vibration

    Glad to hear you solved your problem!!

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