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Old June 8th, 2013, 06:51 PM   #1
Cummins-coal
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Default Jeep rear end vibration

I bought a 1998 Jeep Wrangler about a month ago. When I test drove it, it had a vibration to it, and the guy I bought it from said that it was the tires, and they were out of balance, and had a bad wear pattern to them. I figured that it wasn't the tires, but probably the drive shaft. It had a transfer case drop on it, even though there was no lift (I could tell that it used to have one on at some point), and the u-joints were really sloppy. When I got it home I Installed a 4" lift, SYE, and some 33's. I got a new CV driveshaft made, and took it for a test drive to the alignment shop. The vibration didnt go away, it actually got worse. I took the rear driveshaft out, and put it in 4x4 to see if it would go away, and the vibration was almost non existant. So im guessing that it is something to do with the rear axle. I opened up the diff and there wasn't any bad wear on any of the teeth. I replaced both outer bearings and seals, new brakes, and it still has a bad vibration. What can it be? Any help would be great.

Thanks

Edit- its a Dana 35 with 3.73's

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Old June 8th, 2013, 06:59 PM   #2
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Also it is worse under power. If I let off the gas, the vibration is not as bad.
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Old June 8th, 2013, 07:00 PM   #3
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What is the drive shaft angle?
needs to be a straight shot to the t-case with a c/v shaft.
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Old June 8th, 2013, 07:08 PM   #4
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Old June 8th, 2013, 07:11 PM   #5
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You will need to raise the pinion.
Option 1:Adjustable upper control arms.
Option 2:Cams for the upper mounts at the axle.
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Old June 9th, 2013, 06:40 AM   #6
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^^^^ this

It may have been viberating before because the tcase was too low with no lift. Now you have the same problem but it's reversed.
If you get the shaft inline and it doesnt fix it I would check the pinion bearings, and preload.
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Old June 9th, 2013, 10:42 PM   #7
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Any suggestions on what control arms? Would like to support vendors if possible.
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Old June 10th, 2013, 09:00 AM   #8
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I cant really comment on arms. I know alot of the cheaper ones eat up bushings in a hurry. I will be buying the terra flex or currie I think.

As a test you could try lowering your t-case temporarily to see if it fixes your vibes.
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