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Help diagnosing sloppy drivetrain

jeepdoggy

NAXJA Forum User
Location
California
2000 5 speed 4x4 XJ. Foot on/off gas results in jolting which I assume is due to excessive play somewhere in the drive train. Especially severe (whiplash amost) at some speed/rpm combinations like around 50 mph/2Kish rpm in third but detectable at any speed.

We started to look around the drive train and see some small play but no smoking gun. I would prefer not to just start replacing parts so I'm wondering if anyone has some experience based suggestions to help us zero in on the cause.
 
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