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Old 02-02-2012, 04:27 PM   #1
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chasing the vibrations

need help on where to look next. My situation: I have been chasing bad vibrations in my 95 yj for about a year now and Iv'e hit a wall. I have a 95 yj with a 4" rough country lift. Started out with a bad vibration under heavy load( upon acceleration, Deceleration and gassing it at a low speed. I have since replaced Front and rear driveshafts, all ujoints, rear spring and shackle bushings, all shocks,all front end steering components, entire brake system, rebuilt front and rear ends, installed new headers back exhaust, installed sye kit and rebuilt transfer case, also tune up, new motor and tranny mounts and torque stud. pinion angle in rear is looking good for current setup(double ujoint driveshaft and sye). vibration under heavy load is gone and now it's just a constant vibration under any load and I now have a steady thumping vibration after installing new front driveshaft. Help please I am stumped.

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Old 02-02-2012, 06:44 PM   #2
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I would check the front driveshaft. Yjs don't turn when moving unless someone has modded it or you are having disconnect issues. That would give you a vibration and with it making a noise I'm sure it's turning.

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Old 02-03-2012, 04:52 AM   #3
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Thanks, I'll get her up in the air and check it out today.
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Old 02-03-2012, 05:13 PM   #4
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Checked out front driveshaft today. First I left it on the ground put the transmission in gear and tcase in 2 wheel. I could rotate front driveshaft freely by hand. then I put tcase in 4hi and engaged front axle. Tried to move axle by hand again and could not move it. I didn't have my jack stands with me to raise jeep and run to see if driveshaft would move out of 4wheel. I did remove front driveshaft and grabbed front yoke on diff It had a very small amount of movement side to side and in and out of diff. could this be the cause of vibration? I hope not I just spent $500 at a drivetrain shop to have this rebuilt.
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Old 02-04-2012, 04:47 PM   #5
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That pinion shouldn't move side to side our even in and out. Take it back to them.
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Old 02-04-2012, 08:13 PM   #6
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While the drive shaft is out take it for a ride and see if vibration is still there. My YJ has been modified and the front shaft turns all the time. I had a vibration that began @ about 40mph and got worse with speed. Mine was front shaft. Good luck
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Old 02-06-2012, 06:03 AM   #7
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I removed front driveshaft and test drove it. vibration is diminished but not gone. She's going into the shop this morning. I hate to send it to someone else to work on, but I gotta make money to build up the parts bin. Spring will be here before I know it and I am bound and determined to wheel her by April.

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