Slow Diff Fluid Leak At Fill Plug. Normal? - JeepForum.com
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post #1 of 6 Old 07-03-2020, 01:59 PM Thread Starter
DetroitMan
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Slow Diff Fluid Leak At Fill Plug. Normal?

I have a slow leak at the rear differential fill plug. There is a little oil residue running from the plug to the bottom of the differential, and a couple of small beads (1/4 inch) on the garage floor. I confirmed the leak is ongoing by wiping the differential clean, and there is visible new residue on it after about 3 weeks. Is this normal, or should I be concerned?

EDIT: It's a Chrysler 8.25 with a rubber fill plug.


1999 Jeep Cherokee. So far stock. Overland build planned.

Last edited by DetroitMan; 07-03-2020 at 02:35 PM.
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post #2 of 6 Old 07-03-2020, 02:27 PM
nathan915
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A leak that slow isn't too concerning. Start by replacing the rubber plug and cleaning up any grit around the fill hole.
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post #3 of 6 Old 07-03-2020, 06:35 PM
Fourspeedman
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I hate that stupid plastic plug they used. What? Too hard to use a threaded fitting that WON'T leak?!? So do as I did. Fill to the level of the hole, raise the rear so the oil flows away from the hole. CLEAN the area well like with carb cleaner. Then install the plug with some sealer like Ultra Black. No leaks!

Mark in Queens- Home of Spiderman and the Ramones
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post #4 of 6 Old 07-03-2020, 07:07 PM
2oldjeeps
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might check vent hose too

99wj,143,000 miles
00xj,177,000 miles
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post #5 of 6 Old 07-04-2020, 01:58 AM
Ralph77
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Originally Posted by Fourspeedman View Post
I hate that stupid plastic plug they used. What? Too hard to use a threaded fitting that WON'T leak?!? So do as I did. Fill to the level of the hole, raise the rear so the oil flows away from the hole. CLEAN the area well like with carb cleaner. Then install the plug with some sealer like Ultra Black. No leaks!
While I don't hate it I did always wonder why it is not a traditional plug like in the front.
When I swapped over to synthetic gear oil in my '00 I did replace it with a new one.
Thinking it cost $3 for one. LOL.
First one didn't leak but I replaced it anyway. Second one has not either.
I just swapped out that synthetic I put about 6 years ago.
But I just sucked it out. Did not remove the cover.
I toy with the idea of getting aftermarket covers with a drain plug.
But what I don't understand is the position of the fill hole in those things.
Looks high. And I am one of those people that check there diff level every time I change my oil.
Open it up, give it a quick pump, let it dribble out, close it back up, and call it a day.
Best I can tell you can't check the level with an aftermarket cover like that.
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post #6 of 6 Old 07-04-2020, 07:52 AM
Fourspeedman
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My buddy had a shop and he replaced lots of those rears. Same story every time- lack of oil. In fact he said they were scarce as anything because so many failed. It just seemed a no-brainer to improve on that dumb plug just to keep the oil from sneaking out. It is not a gravity leak. The oil gets flung about by the gears. Both my XJ's showed leakage there when we got them.

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