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Old February 27th, 2006, 07:13 AM   #1
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Default Vibration felt in rear at 70-80 mph only

I have a 97 TJ with a small lift and slip yoke elimator that have been on for some time. Just noticed lately that starting slightly at 55 mph, more pronounced at 70-80mph. If I disengage the clutch, the vibration is still there. Any suggestions, I'm thinking pinion bearing but thought I would get some other ideas first.
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Old February 27th, 2006, 09:00 AM   #2
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do you feel the vibes through the body of the jeep? Through the steering wheel? Through the trans lever (if you had a manual)?

Have you rotated the rear tires to the front?
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Old February 27th, 2006, 09:10 AM   #3
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Quote:
Originally Posted by Bones
do you feel the vibes through the body of the jeep? Through the steering wheel? Through the trans lever (if you had a manual)?

Have you rotated the rear tires to the front?
! dont drive 70-80 .. not sure of any place in michigan where the speed limit is above 70 :P
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Old February 27th, 2006, 09:13 AM   #4
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If you only feel the vibration in your rear......look behind you.....it's probably cube
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Old February 27th, 2006, 09:26 AM   #5
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Things to try:

#1) Inspect rear driveshaft U-joints
#2) Remove rear driveshaft and check for play in SYE and pinion yoke/bearings
#3) Rotate tires, inspect for crap in the rims and drive that setup to test.

You could try pulling the rear shaft and driving in 4wd at 65 mph if your front shaft doesn't also have balance/vibration issues.
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Old February 27th, 2006, 10:05 AM   #6
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I feel the vibration in the back of the seat, rear center console area (where my arm rest). I did move the tires around and it didn't change. The rear u-joints feel tight but I have not removed the rear shaft yet. Did not feel any play in the slip yoke either. Rear pinion had a little movement up and down.
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Old February 27th, 2006, 08:04 PM   #7
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Sounds like tire balance to me.
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Old February 27th, 2006, 08:16 PM   #8
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lets open the floor to wild speculation. I will throw out that it might be a family of opposums squating in your axle.
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Old February 27th, 2006, 08:22 PM   #9
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Quote:
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lets open the floor to wild speculation. I will throw out that it might be a family of opposums squating in your axle.
no way.. its a family of badgers that have burrowed into each seat..
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Old February 27th, 2006, 08:35 PM   #10
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sorry, but you knew this was coming

http://www.albinoblacksheep.com/flash/badgers.php
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Old February 27th, 2006, 10:05 PM   #11
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Damn you Sandles...you beat me to it.

Oh.....and you drive your Jeep 80? Maybe you need bigger tires.
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Old February 28th, 2006, 07:13 AM   #12
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Thanks guys, I checked last night and it was a dancing family of badgers . Pest control is coming to remove them today.

And no, I don't think tire size has anything to do with it. I run a 33 and it only turns 2300-2500 rpm at 70-75mph.
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Old March 1st, 2006, 09:29 AM   #13
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Quote:
Originally Posted by JEEPR
Sounds like tire balance to me.

i agree.......this is what happened to my TJ. between 55 and 60 i was getting a vibration, it was actually time to get new tires but the guys at the tire place said it was because of the balancing of the tires, they coulda re-balanced the old tires but i got new ones and the vibration went away immediately. Try it, it is a cheap fix if it works out, if it doesnt fix it i dont know i am not a mechanic
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Old March 1st, 2006, 09:12 PM   #14
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this may sound odd (well, not as odd as badgers or opossums) but check your front wheel bearings if your still running the dana 30.
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Old March 3rd, 2006, 06:32 AM   #15
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What rear axle do you have??

-I would swap around the tires and see what happens......
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