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Unread 11-19-2011, 08:43 PM   #31
RubiconRazorbac
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Quote:
Originally Posted by jutgin
Are we sure it's pinion angle causing vibration? Could be a number of other things.
It's the first thing he should make sure is perfect. Then move on down the list

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Quote:
Originally Posted by Imped View Post
Your shaft isn't long enough to handle that kind of droop...
My build thread: http://www.jeepforum.com/forum/f9/ru...thread-792423/
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Unread 11-20-2011, 06:37 AM   #32
TheOrffs
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rubicon what else could it be. The tires are balanced, the jeeps aligned, pinion bearing are good, dont know what else.
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Unread 11-20-2011, 06:46 AM   #33
Barcus
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Are you getting vibes during accelerating/decelerating? If that's the only time you get vibes then its your pinion angles.
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Unread 11-20-2011, 08:08 AM   #34
bikerdude
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When I did mine, I put the rear on jackstands, removed the rear tires, and ran it like that at all speeds to see if there was driveline vibration without the possibility of feeling vibration from the wheels.
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Unread 11-20-2011, 08:11 AM   #35
biffgnar
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Quote:
Originally Posted by bikerdude View Post
When I did mine, I put the rear on jackstands, removed the rear tires, and ran it like that at all speeds to see if there was driveline vibration without the possibility of feeling vibration from the wheels.
With the jackstands on the frame or the axle?
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Unread 11-20-2011, 08:31 AM   #36
fowfiddy
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i would say it is the rear output shaft nut torque spec. in the destructions they call for i believe 150ft-lbs i found this to not be enough and tightented mine to 185 and the vibes went away. your pinion angle can be set to the eye i believe. you want your ujoint at the axle to be as straight as possible
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Unread 11-20-2011, 08:33 AM   #37
jutgin
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Originally Posted by TheOrffs View Post
rubicon what else could it be. The tires are balanced, the jeeps aligned, pinion bearing are good, dont know what else.
I just fixed my 40 mph wobble with new driver side ball joints. That may be something to check if it has not been already.
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Unread 11-20-2011, 11:32 AM   #38
TheOrffs
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Thanks for your help everyone it was the pinion angle. I just fixed a couple minutes ago. All i had to do was lengthen the rear upper control arms to straighten out the pinion angle. I also just fixed the lean of the jeep. The jeep was leaning to the passenger side by like an inch and i used the sway bar links to fix it.
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Unread 11-20-2011, 11:58 AM   #39
Necromancer_tat
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Quote:
Originally Posted by TheOrffs View Post
Thanks for your help everyone it was the pinion angle. I just fixed a couple minutes ago. All i had to do was lengthen the rear upper control arms to straighten out the pinion angle. I also just fixed the lean of the jeep. The jeep was leaning to the passenger side by like an inch and i used the sway bar links to fix it.
I'm glad you figured it out!
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Unread 11-21-2011, 04:25 PM   #40
bikerdude
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Quote:
Originally Posted by biffgnar View Post
With the jackstands on the frame or the axle?
For future reference, I had my jackstands under the axle so that everything was sitting the way it would be while driving. I had made my own driveshaft by shortening an xj front shaft and wanted to check my work. It had no vibration so I was relieved.

OP, good to hear you got it fixed, happy wheeling!
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