Need help! Jeep vibrating really bad after 20mph - Jeep Wrangler Forum

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Old 02-10-2014, 11:11 AM   #1
Join Date: May 2012
Posts: 43
Need help! Jeep vibrating really bad after 20mph

Hey, guys I have a 91' yj with 4.0L engine and need some help on something, when i'm driving and start to go over 20mph my jeep starts to vibrate violently until i stay a constant speed, once I am at a constant speed it vibrates less and when I let off the gas and let it coast it stops vibrating completely then goes right back to vibrating when I hit the gas. I'm going to fix my u-joints and get a wheel alignment tomorrow but say that doesn't work what else could it be? I was thinking maybe my motor or transmission mounts might be worn or my tie-rods need to be replaced. Does anyone have any other suggestions or helpful tips????????

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Old 02-10-2014, 11:31 AM   #2
W5KVV's Avatar
Join Date: Oct 2013
Location: S.E. Oklahoma
Posts: 824
Sure sounds like a U joint is on its way out. No vibes on decell, vibes on accel is a dead giveaway.

I would hold off until you get the U joints swapped & go from there.

1995 Rio Grande - 4"RC - 1/2"booms - 33's - 4:88's - 1"MML -
Belly up/302/NP435/NP208/8.8 swap about to start
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Old 02-11-2014, 09:13 PM   #3
Join Date: May 2012
Posts: 43
Yeah it was those damn u-joints and they were bad
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emergency , shaking while acclerating , yj jeep , yj jeep wrangler

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