Squeeky suspension noise and Differential Leak... - Mustang Evolution

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Old 07-18-2015, 01:12 PM   #1
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Squeeky suspension noise and Differential Leak...

Hi guys,

I was under my 2013 Mustang GT today adjusting the exhaust tips for the umpteenth time (I can never seem to get them to stay in one spot) and I noticed what appears to be a leak around my differential.

I highlighted the wet greasy spots in the pictures below.

My car has occasionally been making a slight squeaky noise from the right rear-end that I thought might be a bushing or something in my suspension that needs some grease. But now I'm wondering if this leak has something to do with the noise.

Does anybody have any ideas what the issue could be?


The area around the differential cover is dry, so I'm guessing the grease is coming from somewhere in front of it. Yet there appears to be some on the left side of the differential as well.

Thanks
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Old 07-18-2015, 03:03 PM   #2
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Totally normal , fluid on the diff is from the pressure vent on the top of the axle . It bleeds when under pressure and releases fluid out of the axle


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Old 07-18-2015, 04:50 PM   #3
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Totally normal , fluid on the diff is from the pressure vent on the top of the axle . It bleeds when under pressure and releases fluid out of the axle


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True but there is a TSB out for the vent tube to stop it from shooting out everywhere. As for the front of the axle it could be a leaky pinion seal. I had mine replaced a few months ago because it was leaking.

http://www.latemodelrestoration.com/...ang-TSB-Recall

Second one down for the vent tube.
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Old 07-18-2015, 05:01 PM   #4
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Quote:
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True but there is a TSB out for the vent tube to stop it from shooting out everywhere. As for the front of the axle it could be a leaky pinion seal. I had mine replaced a few months ago because it was leaking.

2013 Mustang TSB's and Recalls

Second one down for the vent tube.
Thanks guys!
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Old 07-18-2015, 05:06 PM   #5
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This is the TSB. I'm not sure if the link worked it kinda freaked my phone out then I clicked on it.
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Old 07-19-2015, 12:47 PM   #6
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Just put on a Ford Racing diff cover yesterday. I plugged the axle vent because it was puking lube from the same spot. The new cover has a vent at the top - I ran a hose from it up to the body then put the vent on the end of it. I'll post a pic later. I found some cool braided hose to use so it looks trick - though it's overkill.
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Old 07-19-2015, 01:34 PM   #7
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My TrakPak 14 just puked a pinion seal at 8000 miles and was throwing oil underneath the car on the bottom of the gas tank. When I took it into the dealer for warranty the mechanic told me they were going to put in a revised seal. The seal that was in the car is plastic...............the revised seal is metal like most of the pinion seals I have ever seen are.
Venting the rear axle into the car is a great idea....................as long as you have something that can catch any stray oil. I've done this in all of my drag cars since it's mandatory.
Here is the catch can w/breather attached to the roll cage in upper right side of the
picture and the line is running along the trunk floor down to the rear axle housing.
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Old 07-19-2015, 03:12 PM   #8
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I was hoping the elevated 1.5 ft of tubing would be enough to allow for expansion. It's not a dedicated track car...
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Old 07-19-2015, 03:14 PM   #9
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Old 07-19-2015, 04:06 PM   #10
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Quote:
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I was hoping the elevated 1.5 ft of tubing would be enough to allow for expansion. It's not a dedicated track car...
Quote:
Originally Posted by tezz View Post
Attachment 187512


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In the drag car after a 2/3 days of racing I'd have at least a tablespoon or two of oil in the catch can..............probably 25/30 passes at 1320' per pass....mayb 10 miles.
A rear end has no place to breath other than the breather and during a hard track day or a long road trip it will be interesting to see how your system works.
I've had my car on the lift many times and never really looked at the breather and where it goes...next time it goes up I'll pay closer attention.
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Old 07-21-2015, 06:17 PM   #11
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**Update**

Just picked my car up from the dealer. They claimed it was the pinion seal causing the leak and changed it under warranty.

They didn't mention repairing the axle leak at all. So they may have missed that one or decided it wasn't an issue.

Thanks anyways for the help guys!
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