All, just to get you know I just had my rear diff cover replaced today. The cover has been leaking for sometime and the Ford Service stated this is an issue on the newer Mustangs. They also said there is TBS for this but it only states to clear the vent but the dealer knows that this does not work so they ordered the GT500 diff cover to replace the POS stock steel stamped one. They also relocated the vent on the new cover as well. So all owners of the 2013 & 2014 Mustangs check your covers to make sure they are not leaking. What concerns me was the dealer near to my house did not see the issue and the dealer where I bought my car did so I know now where I am taking my car for future service.

 

Had the same thing happen to my 13 GT/CS about 6 months ago. After the fix I have not had anymore problems until about 2 weeks ago. I'm starting to notice new fluid on my driveway. Im going to see about the GT500 diff cover your talking about and lets hope I dont have anymore issues.