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Old 03-25-2010, 09:43 PM   #1
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Changing front/rear axle pinion seals, question!

My '97 TJ has leaking front and rear driveshaft pinion seals, and I'm about to replace them. I've come across a few handy how-to's online, though none of them answer my question....when the seal is removed, will the differential oil pour out behind it? I mean, it's leaking because there is oil BEHIND the seal; theoretically (I believe) it'll come gushing out if I don't drain the differential first, right? None of the how-to's list "Drain differential oil" as a step in the process, so I may be over-thinking it. But, just want to be sure before I make a mess in my garage. Thanks in advance

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Old 03-25-2010, 09:46 PM   #2
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yes it will, drain it first

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Old 03-26-2010, 01:02 PM   #3
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I replaced mine and I had already drained the oil. Doesn't hurt to change the oil anyway. It will gush out just run slowly IIRC.

Make sure you put it in straight and if you find yourself having to remove it plan on installing a different one (trust me on this) Use a big socket or something circular to install.
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Old 03-26-2010, 01:10 PM   #4
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It won't gush out, the gear lube is just up to the level of the seal's bottom. I've done several seal replacements and I never drained the gear lube first.
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Old 03-26-2010, 01:36 PM   #5
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sorry, i mean it wont gush out, just run slowly if that.
Come on Jerry, I am trying to get him to change out his gear oil too!
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Old 03-28-2010, 12:09 PM   #6
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Well, i actually changed the gear oil not long ago (maybe 3k miles ago, also replaced the differential cover seals with LubeLockers; great product btw!). Pinion seals leaked residual amounts of oil before oil change, now losing about a tablespoon per week judging by the amount on my driveway. Hence my original question - I didn't want to have to drain the oil if I didn't have to and risk contaminating it since it's new oil; just thought it would drain itself once the pinion seal was removed but if it won't then I'm good to go
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Old 03-28-2010, 02:30 PM   #7
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I didn't replace my rear pinion by myself, but I was there. The fluid didn't drain. Get a good replacement seal. Most recommend Chicago Rawhide, which also can go by a different name. I got mine at Napa
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Old 03-28-2010, 04:45 PM   #8
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Lubelocker is a good choice, I tend to change fluids frequently. Unless you put a diff cover on with a raised fill plug, then you should not have much if any fluid come out. Make sure to set the seal squarely, then drive it home.
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Old 03-28-2010, 09:38 PM   #9
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Ordered mine thru 4WD.com, not sure of the brand though. Thanks for the help gents
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Old 06-02-2010, 12:52 PM   #10
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Quote:
Originally Posted by DontTellMeAboutCajun View Post
Ordered mine thru 4WD.com, not sure of the brand though. Thanks for the help gents
4WD carries Omix-Ada seals. Ordering a couple today to do my front, 1 extra, just in case. I was just bringing this back up due to the top as I was looking for opinions on the LubeLocker diff cover seal. Seems like everyone likes it so I'll prolly grab one as well. RTV sucks!
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Old 06-02-2010, 04:42 PM   #11
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Quote:
Originally Posted by Bigstonz View Post
I didn't replace my rear pinion by myself, but I was there. The fluid didn't drain. Get a good replacement seal. Most recommend Chicago Rawhide, which also can go by a different name. I got mine at Napa
Yes Chicago Rawhide is my recommendation too but they're not as easily found since they were purchased by SKF a couple years ago. The benefit to a CR seal is they seem to be made a little more ruggedly which can really help during the installation process. They are an extra-nice seal if you can figure out how to get one and odds are it will take looking in an SKF catalog to find one.

SKF Seals
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Old 08-11-2010, 10:31 AM   #12
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Resurrecting this thread as I'm looking for a walk through of replacing both front and rear diff seals - I have a D44 rear.

Curious if I am able to do it myself - difficulty level etc. I hear a breaker bar may be needed. Any links?
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Old 08-11-2010, 04:12 PM   #13
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I'm good to go - found what I was looking for:
http://www.wranglerforum.com/f5/impa...nch-49423.html

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