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Old 04-16-2013, 11:13 AM   #1
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Rear main seal, or worse?

Can't get the video to upload on my phone, but essentially I can pull my rear driveshaft in and out of the differential about 1/8" or so. I was thinking the seal needs replacing, but will that fix this also? I just put a Zone 4.25" combo lift on, but all else is stock. I did drop the transfer case by about 3/4" with washers, but the leaky seal has been around for a while.

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Old 04-16-2013, 12:08 PM   #2
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If you can pull your rear DS in and out of your differential by 1/8th", it wouldn't be due to a rear main seal issue. The RMS is located in the engine. I would suspect an issue with the pinion bearing.

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Old 04-16-2013, 12:20 PM   #3
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Thanks for the clarification. Is the pinion bearing an easy fix? I would like to fix the leak from the rear diff as well.
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Old 04-16-2013, 12:21 PM   #4
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Is the pinion yoke nut torqued properly?
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Old 04-16-2013, 12:24 PM   #5
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I haven't checked. I haven't done anything with diff at all, but can double check it.
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Old 04-16-2013, 01:31 PM   #6
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Had a couple of my boat mechanics look at it (one owns 2 Wranglers) and they agree it is the rear pinion bearing. Is this a weekend-style project? And can it be driven safely for a couple weeks before I can get everything ready to do the job? Any special considerations while prepping? I was planning on eventually regearing to 4.56 from 3.73. Should I do this at the same time? Cost? Reliable brands? Thanks for all the help in advance!
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Old 04-16-2013, 02:12 PM   #7
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Doing a pinion bearing can be done in a weekend, but requires a press to press the old one off and the new one on. There are ways to do it without a press, but it requires the careful use of a die grinder, a freezer and a stove . Just make sure you keep track of all the shims and bearing caps.


Regearing an axle would take much longer (and would be much more expensive) than just replacing the bearing, due to the finicky nature of setting it up properly, so I would advise holding off on that. Yukon and spicer are good brands.

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