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Old 04-27-2007, 05:56 PM   #1
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Dirty Rear Diff? 1995 4.0

I may not be so mechanically inclined that I can do much more beyond simple maintenance, but I am pretty certain fluids and grease should stay inside assemblys and not migrate to the outside?

On my Jeep, the front Diff is dry and clean as is the tranny and transfercase. However, even though the rear Diff doesn't drip or leak to the ground, it builds up with dirt and grease on the diff itself and at the axel junctions. Just had fluids changed and the guy checked the rear diff and said it was still full and clean and no leaks? Seemed to indicate all was normal.


Perhaps it is normal..but not desirable from my perspective. Are there seals at the axel juctions that may be leaking? Is this condition something that should be fixed or just something to be sprayed with degreaser and hosed off now and then? The jeep is completely stock with 50k miles. If something to be fixed would it be an expensive fix?

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Old 04-27-2007, 06:57 PM   #2
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Personally, (and I'm not a mechanic by any stretch of the imagination), I'd clean the stuff off and see it it accumulates again. It may be gunk left over from an old, no longer active leak. Also, if there is a small leak, you'd be able to tell a lot sooner with a clean rear diff.

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Old 04-27-2007, 07:03 PM   #3
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One more thought....how much of that might be oils getting kicked up off the road and accumulating there? The rear tends to get a LOT more of that crud than the front.

May be way off, but it makes sense in my brain, challenged though it may be.
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Old 04-27-2007, 08:02 PM   #4
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Hey Jamie,
Just did a three rounds of soak and rinse off. Got most of the gunk off but there are a few areas that will need to be scraped unfortunately. About two years ago I had the diff serviced (cover removed, gears box cleaned out, etc.. The outside was clean at that time. It stayed that way for quite a while so I just stopped checking. Anyway, guess I'll pay attention now and see of I can detect if I have a new leak somewhere. sigh
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Old 04-27-2007, 08:19 PM   #5
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Dave try spraying it with the high pressure hose at the manual car washes.. might help taking off the rest of the gui stuff off or also brake cleaner will do the job also. When replacing fluid they should apply a layer of sealant around it instead of a gasket which leaks within limited time. Next time you get your diff oil changed ask them how they seal it back up.. using a gasket or locktite or what else..
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Old 04-27-2007, 10:47 PM   #6
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When it was done..it was at a Jeep specialty shop and I watched them. They used sealant and not a gasket. If it is leaking from around the cover..it isn't obvious. Where the axles enter the diff there was a lot of build-up and behind the yoke from the axle on the back of the diff mostly. Could be throw off from over zealous lube perhaps? I change get the oil every 3K and they lube it each time. I will use a bit of break cleaner to make it obvious if there is a leak and then watch. I started the thread because I was wondering if this was a common occurance with YJs after so many miles...but it sounds as though it isn't.
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Old 04-27-2007, 11:00 PM   #7
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My turn signals just stopped working all of the sudden

tripple88a,

You seem to have a good bit of knowledge. What do I do? I have a 1999 Jeep Wrangler 4 wheel drive, 4 cylinder, 2.5 liter with A/C and power steering. I all ready checked and changed the fuse. That's not it. My Owners Manual doesn't cover it at all.
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Old 04-28-2007, 12:56 AM   #8
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do the hazards work at all? Might be the switch.. on mine my hazards switch is damaged and it actually meses up my regular blinkers.. so let say i move the hazards switch a bit then one of my blinkers wouldnt work and sometimes both so i gotta align the hazards switch untill my blinkers just start working.. its one cambo switch i think

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