Vibration over 65mph...need some input.

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03-31-2009, 10:11 AM

jamoka3

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Join Date: Mar 2009

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Year: 1997

Model: Grand Cherokee

Engine: 4.0 L

Vibration over 65mph...need some input.

I have a slight Harmonic vibration over 60-65mph on the highway BUT, only when i let OFF the gas!
over 60-65 and under 60 NO vibration but when I'm over 60mph and let off i get a vibration. any ideas?
wheels are balanced, drive shafts in check.
i think maybe the rear u joint might be going? or maybe the transfer case needs to be dropped a little more?

i have a Rubicon express super flex 4.5" lift with Cooper 32" Discoverer STT tires. and the kit came with 3/4" transfer case drops, that i did install but the vibration is still there...

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03-31-2009, 01:22 PM

RRAM

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Location: Medicine Hat Alberta

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Year: 1993

Model: Grand Cherokee

Engine: 5.2

sounds like something a u-joint would do. I am guessing that this jeep is lifted for you to have dropped the transfer case. Once you start doing that I wish you luck. for every action there is a reaction and sometimes its hard to find.