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Old 03-24-2012, 05:54 PM   #1
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Question about a job

So, after months of battling vibes once I shift into 4th and hit 35-40 mph, and getting help here, I am thinking about changing out my rear pinion bearings. Would bad bearings cause vibes like the ones I have described? There is a slight squeal when im in 3rd or 4th gear and going up a hill.

So, my real question is, how tough of a job would this be to replace the pinion bearings (inner and outter)? Im by no stretch of the imagination a mechanic, but with instructions I have gotten a 4" lift on and did my SYE (with a little help from a friend). Is this just something I should bite the bullet on and take it to a Jeep mechanic in the area (Jeff Daniels Jeeps)? Input is always greatly appreciated. Thanks guys.
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Old 03-24-2012, 09:00 PM   #2
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I'd double check the pinion angles before you replace anything. If you did the sye/cv then you need to point the pinion at the trans.

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Old 03-24-2012, 10:52 PM   #3
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Quote:
Originally Posted by jgorm
I'd double check the pinion angles before you replace anything. If you did the sye/cv then you need to point the pinion at the trans.
Ive tried the pinion at the exact same angle as the DS, 1* below and 2* below and still have vibes.
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Old 03-24-2012, 10:58 PM   #4
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Quote:
Originally Posted by jgorm
I'd double check the pinion angles before you replace anything. If you did the sye/cv then you need to point the pinion at the trans.
Yea I do have SYE and cv DS. I've gone from pinion angles 1* lower than the DS, 2* lower, and identical angles, still have vibes at all. I'm thinking it's the seal/bearing because of the squeal I get when it's it's strained.
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Old 03-24-2012, 10:59 PM   #5
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Sry for double post. Damn phone app is annoying.
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Old 03-25-2012, 01:20 PM   #6
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Also, would I need to replace the shims as well?
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Old 03-27-2012, 05:31 PM   #7
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Bump. Anyone have input on this?
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Old 03-27-2012, 06:01 PM   #8
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Take the rear drive shaft off and drive around in 4wd for a while. If it still vibrates you may have bad u-joints in the front shaft/axle, or a bad balancer/flange on the SYE kit.

The pinion bearings are a strange failure. They don't see alot of lateral force, and are constantly doused with gear oil from the diff.
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Old 03-27-2012, 07:20 PM   #9
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I should have added that. I removed the rear DS and drove in 4Hi and it drove like a charm. How can I test the SYE flange?
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Old 03-28-2012, 05:04 PM   #10
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I get paid tomorrow so I'm trying to decide if I should order new bearings, anyone have suggestions?

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