Oil splattered all over rear end + plus in transmission - Ford Mustang Forum
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post #1 of 7 (permalink) Old 06-04-2016 Thread Starter
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Oil splattered all over rear end + plus in transmission

Oil splattered all over rear end + PLAY in transmission!

I jacked my car up to get ready to remove my transmission so I could replace my clutch. As I was getting to the driveshaft bolts in the rear, I noticed that there was oil splatters ALL over the rear end of my car. It is on my exhaust pipes and makes my car smell like a two stroke dirtbike when it gets hot. I didn't pay any mind to it at the moment because I needed to get to the trans to replace clutch/TO bearing asap. A little while after getting everything back together and driving it for a week or so, I started to notice play in the shaft ( at least it seems thats where it's coming from). I check all u joints, they are good, I spun the driveshaft by hand and it has a bit of play that seems to be coming from the rear. When driving my car I come to a stop. And when I am ready to go again I have to put it in gear and lightly release the clutch to remove the play so it grabs tightly before I take off. Any idea what could be causing this? I am assuming this leak has something to do with the play I am experiencing. I also park my car in the same place everyday and I do not notice any oil residue in my driveway. Could it be that the rear pinion seal is bad and there is play because it's low on diff oil? The pinion seal doesn't seem to be wet though which is weird. I don't understand where the oil is coming from, but I can only assume it's coming from the rear differential. It is ALL OVER the rear end of my car though. I power washed it all off, and a few days later the same amount of oil was all over the bottom of the car again. Any help would be greatly appreciated as I do not want to blow my rear or be forced to replace my gears due to a worn pinion gear because my rear is lacking oil. I also check the pinion nut, and it has not moved.



Don't worry, I'll wash it off with my beer.

Last edited by xbrxlunch; 06-04-2016 at 12:19 PM. Reason: Edit subject title
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post #2 of 7 (permalink) Old 06-04-2016
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Sounds like pinion seal is leaking. If gear oil is coming from the forward facing side of the pumpkin then that's the only place for it to escape.

Disconnect the driveshaft from the rearend, set parking brake and check for excessive play by attempting to turn the flange and also pull/push the flange (endplay). It should move very little (1/16" or less) while turning, and endplay should be virtually unnoticeable.

While doing the above, you may just want to pull the cover and get a look inside. Going by your description though it sounds like a rebuild may be in your future.



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post #3 of 7 (permalink) Old 06-04-2016
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if you have an after market driveshaft like a DSS with a cv joint, then it is coming from that. Its slinging grease all over. I had that problem.

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post #4 of 7 (permalink) Old 06-05-2016
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It's probably the pinion seal, but I find it strange that you're not finding wetness around the seal itself. The pinion nut is installed very tightly with a threadlocking compound, so I wouldn't have expected it to be loosening up anyway. Worn bearings are the more likely culprit here. Good bearings allow the pinion to simply spin in place, but bad bearings allow it to move around and wear out the pinion seal. A fluid leak is often a good indicator that it's time to open up the differential.

At this point, I'd grab the pinion flange and try to wiggle it as SoCal2V suggested. It may indeed be time for an overhaul.

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post #5 of 7 (permalink) Old 06-05-2016 Thread Starter
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Originally Posted by Blackpenguin69 View Post
if you have an after market driveshaft like a DSS with a cv joint, then it is coming from that. Its slinging grease all over. I had that problem.
No aftermarket driveshaft.

I believe the previous owner had a different set of gears installed. I guess I'll tear the diff apart tomorrow and see what I can find. Can anyone give me any insight on the gear oil I should use when I put it back together. And I believe it needs friction modifier too, right?


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post #6 of 7 (permalink) Old 06-05-2016
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You haven't given any details about what kind of Mustang you have. But since you posted this thread in the 4.6 section, I'm going to assume that it's a GT model, and therefore has the 8.8 rear end with Traction-Lok. In that case, Ford specifies 75W140 synthetic gear oil with 4oz of XL-3 friction modifier. Open differentials don't need the XL-3.
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post #7 of 7 (permalink) Old 06-05-2016 Thread Starter
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Originally Posted by Urambo Tauro View Post
You haven't given any details about what kind of Mustang you have. But since you posted this thread in the 4.6 section, I'm going to assume that it's a GT model, and therefore has the 8.8 rear end with Traction-Lok. In that case, Ford specifies 75W140 synthetic gear oil with 4oz of XL-3 friction modifier. Open differentials don't need the XL-3.
Yes, sorry. It's a 1999 Mustang GT w/ 8.8 rear w/locking diff. And thank you.


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