Gear oil in rear wheels after install? - Mustang Evolution

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Old 03-10-2014, 06:49 PM   #1
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Gear oil in rear wheels after install?

So I've put just over 1200 miles on my car since the 373 went in, but every time I wash it the inner rear wheels have some serious grime in them resembling grease. There is no whine and they were installed professionally. Is this normal after gear install? Also I used the higher weight 90w-140 or whatever so not sure if that's an issue.
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Old 03-10-2014, 07:30 PM   #2
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They probably broke the axle seal installing them.
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Old 03-10-2014, 08:18 PM   #3
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Could also be over full?
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Old 03-10-2014, 08:18 PM   #4
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Lol you can't over fill it ,

If you have ever serviced a diff , you will know what I mean by that.
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Old 03-10-2014, 08:39 PM   #5
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I had the same thing happen after having my rearend rebuilt. Id find one or two drops of gear oil on the inside of the rim quite often. There was no evidence of oil being "slung" so I assume that it only does it when the car is sitting. Both of the axles and the seals where replaced.
It hasn't done it for a while now so either it stopped leaking OR my differential has no oil in it...
It wasn't very much, probably two tablespoons leaked out over the course of several months.
My car gets tossed around pretty good once a month autocrossing so the gear oil DEFINITELY makes it to BOTH ends of the axles.
The weight of the oil should make no difference.
If they didn't replace the axle seal, that could be the problem. If they DID replace the seals, the axles could have grooves worn into them from the seals. Or as Slow4v said, they may have boogered up the seal reinstalling the axles. Crawl under there and wipe everything down and then see how much oil is leaking and how fast it's leaking.
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Old 03-10-2014, 08:41 PM   #6
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Quote:
Originally Posted by Slow4V View Post
Lol you can't over fill it ,

If you have ever serviced a diff , you will know what I mean by that.
You can if the differential is not level when you fill it.
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Old 03-10-2014, 09:20 PM   #7
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Well I gave them the full install kit from late model restoration which included those seals so I'm assuming they where replaced...I might try to bring the car to them this weekend to swap the oil at roughly 1500 miles and to fix this. Its def not a lot either, but it's disturbing that eventually it could run low on fluid and I'm running out of sponges to clean the crap off the inside of my wheels. Will they be able to spot that during the flush? Thanks guys
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Old 03-10-2014, 11:07 PM   #8
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If it continues to leak, it will be easy to spot where it's coming from. Yeah, let the guy who did it have a look at it.
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Old 03-11-2014, 05:38 PM   #9
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Usually when I service diffs, I pour fluid until it pours out the middle plug, and I plug it up, which is about half full
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Old 03-11-2014, 06:28 PM   #10
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Isn't there only one plug? Also when I called the shop today the guy said it wasent common to replace those with just a gear swap. Either way they said they would handle it and swap out the axle bearings and seals if needed.
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