2013 v6 Mustang Rear axle leak - Ford Mustang Forum
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post #1 of 11 (permalink) Old 10-05-2018 Thread Starter
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2013 v6 Mustang Rear axle leak

Hi All, I just noticed a leak on my rear axle. I did some searching around and looks like it may be a rear axle vent leak. Some pictures are attached. Do you have any thoughts on what the issue is? Also, how much it may cost to fix it? I'm not very car repair savvy so I'm thinking I may take it to the dealership. I have almost 80k miles on it so it's out of warranty so it would be helpful if anyone knows how much I can expect a dealer to charge or if it's an easy fix I can do myself. Thanks in advance!

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post #2 of 11 (permalink) Old 10-06-2018
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If you have jack stands or ramps it's an easy fix. If you don't do your own oil changes and other maintenance, might be better to let your local Ford dealer do it . They will charge you around $100 or more just to look at it. Just be sure they top off the gear lube because it looks like most of yours has leaked out

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post #3 of 11 (permalink) Old 10-06-2018
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Ya, most likely the vent. There is a long thread on here with pix showing the problem and solution. As I recall, it was an easy inexpensive fix.
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post #4 of 11 (permalink) Old 10-07-2018
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I hate to be the bearer of bad news, but from the looks of the pictures, especially #3 it is the Pinion seal, they are prone to go out when the axle vent plugs since the pressure builds up and that is the weakest point. The Vent leaking will not go forward and cause the build up on the exhaust, that is from a leaky seal and getting flung from the pinion flange itself.
Here is the part # for the Vent Tube fix Version 2 https://www.amazon.com/Ford-DR3Z-402.../dp/B01G2MHO9E. The seal is the biggest part since even after removing the pressure it will still leak so that and the fluid should be checked by a mechanic.

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post #5 of 11 (permalink) Old 10-09-2018
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I can't tell for sure from the pictures, that does look like a lot of fluid on the diff, but it could be coming from the vent. The vent is located about 1/3 of the way out on the axle; take a close look and try to determine whether the fluid is coming from there and then dripping down onto the differential housing, or if it is coming from the pinion seal (where the driveshaft enters the differential housing)

If you are inclined to do it yourself, you could fix the vent; clean off all the fluid; refill the diff; and see if it leaks again. Or pay someone to do the whole thing, maybe a couple hundred bucks.
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post #6 of 11 (permalink) Old 10-10-2018
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Definitely worth the $30 or so (part) vent to try the fix your self first though to be honest from your 3rd picture most of the oil looks to be on the right side. The vent on my 2014 was on the left (see leaking-rear-end-fluid).

I would try to hose that off first real good at a pressure wash, maybe use a little brake cleaner on it too first so you start with a dry slate.

I was able to get at mine easy enough by backing it up on an old pair of car ramps. It just clears the height in the rear to get them up without hitting, unlike the front which requires extensions
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post #7 of 11 (permalink) Old 10-10-2018
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I agree with Siber Express. The vent may be plugged, but a good deal of that fluid looks like its coming from the pinion seal, especially with seeing the buildup of crud on the exhaust pipes. Fluid leaking out of a spinning part tends to fling it all over the place.
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post #8 of 11 (permalink) Old 11-24-2018
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I think Ford came out with three different versions to fix the notorious axle vent leak. 1st was the small metal screw in vent, then a screw in turkey baster thing and then they have a about 10" hose with the a small plastic vent attach to the hose higher up in the chassis.

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post #9 of 11 (permalink) Old 11-25-2018
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Another vote here for the pinion seal. I lightened one of your pics, and you can see there's also diff fluid on the plate which covers the gas tank. That's definitely originating from a bad pinion seal.
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mine was the pinion seal.
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The thread is a little old but yes, the pinion seals will go out. Had mine on my 2012 replaced at 37,000 miles under warranty and again at 61,000 miles at my instructions and cost. The second time I had ford replace the seal, the flange and use a new spacer kit, and 70/145 lube . It fixed it the second time.

Turkey baster was installed under warranty before the pinion seals failed.

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