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So I normally park in the garage. Today after driving I notice a leak directly in line with my rear tires. I am not sure what or where it came from. I have a few pictures of underside of my car. I no almost nothing about being a machanic but in the one picture you can see a small discoloration in the metal. I also took a picture of my tranny fluid but it was directly after driving. Can anyone help me out. My car is an auto with full exhaust and Lund tune. Just wanted to mention that incase I have to bring to a dealer. ImageUploadedByMustang Evolution1468869296.233971.jpg ImageUploadedByMustang Evolution1468869310.621190.jpg ImageUploadedByMustang Evolution1468869358.628887.jpg ImageUploadedByMustang Evolution1468869374.980526.jpg
 

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So I normally park in the garage. Today after driving I notice a leak directly in line with my rear tires. I am not sure what or where it came from. I have a few pictures of underside of my car. I no almost nothing about being a machanic but in the one picture you can see a small discoloration in the metal. I also took a picture of my tranny fluid but it was directly after driving. Can anyone help me out. My car is an auto with full exhaust and Lund tune. Just wanted to mention that incase I have to bring to a dealer. View attachment 203516 View attachment 203517 View attachment 203518 View attachment 203519

Spray the diff with degreaser and wash the fluid off then then watch to see if it comes back quickly or slowly . Probably just the breather cap which releases fluid when the diff heats up .


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Take it to the dealer and have them take a look, but agree it is more than likely the Dif breather! The TSB for the issue is 14-0046.:thumb:
 

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The two known rear leaks are pinion seal leak and the axle breather leak.
 

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The breather isn't a big deal is it???

That looks like a pinion seal to me


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The breather isn't a big deal is it???

That looks like a pinion seal to me


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If its pinion seal then you have to bring it in for warranty and fix breather while you at it. I had a pinion seal leak around 10k miles, had to go in twice due to incompetent mechanic.

oops i thought u were op lol
 

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If it's either of those issue do you think the dealer will give me a hard time due to mid pipe and tune?
shouldnt as it has nothing to do with the leak but knowing dealer they can use it against you.
 

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The breather isn't a big deal is it???

That looks like a pinion seal to me


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I sure hope not , mine has leaked for a while now . I've checked the seal multiple times thinking it was that which kinda worried me


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I sure hope not , mine has leaked for a while now . I've checked the seal multiple times thinking it was that which kinda worried me


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check the connection between driveshaft and rear axle, if theres a leak it should show.
 

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As everyone else said, it's either the overflow or pinion. To me it looks like the overflow because the pinion usually throws it in a 360 or 180 degree pattern...although it's really hard to tell from your photos.
I had my pinion go out at less than 7,000 miles and my 14 TrakPak had a lot of mods...lowering, aftermarket UCA/LCA's and a tune. If I were you I'd get a plug that says Do Not Reflash...then the dealer won't touch the port without talking to you. My dealer just replaced the pinion seal under warranty...IMHO
 

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Discussion Starter #12
As everyone else said, it's either the overflow or pinion. To me it looks like the overflow because the pinion usually throws it in a 360 or 180 degree pattern...although it's really hard to tell from your photos.

I had my pinion go out at less than 7,000 miles and my 14 TrakPak had a lot of mods...lowering, aftermarket UCA/LCA's and a tune. If I were you I'd get a plug that says Do Not Reflash...then the dealer won't touch the port without talking to you. My dealer just replaced the pinion seal under warranty...IMHO

Thank you everyone. I will bring it to the dealer this weekend. It doesn't look like much is leaking now but I will keep an eye on fluid level until then.
 

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They could blame the exhaust and tune. You never know.
 
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