Rear axle purge valve leak

[Sparty92]

So I took my car in for it's first oil change yesterday (4,700 miles). The car was up in the air and I was looking around, when I noticed the rear axle was wet on the driver's side of the diff.

Apparently, on the 2010-11 cars, there is a little spring-loaded valve on the top of the axle to allow the fluid to expand/purge under high stress/racing conditions. There was quite a bit of fluid on the axle housing, so they applied brake cleaner and wiped it clean.

The smarter dude of the techs in the area checked my diff. fluid levels, thinking that maybe it was over-filled from the factory and was just bleeding off. The level was fine, he said.

I took the car to Roush today to get my axle-backs installed.
I looked at the axle and noticed some fluid present again, but not as much as before.

Has anyone noticed this on their 2011 GT? I'm going to take it to the dealer and have them replace the valve I think. They put it in my notes for it to be checked at the next oil change interval, but I think I'd rather figure this out now, than later.

 

[Sparty92]

Beuller?

Any comments or suggestions?

 

[parchisi]

mine leaked a little too, but I didn't worry about it....

 

[Ateup]

You should prolly read this from a week or so ago.


http://www.stangnet.com/mustang-forums/831910-blown-differential.html

 

[MyGG]

I have a 2010, but same issue and was told the same as you basically. No big deal it just needs a little hard driving to get to the proper level (leak). I was told it should slow to a stop over the next couple thousand miles, but to keep an eye on it and if it didn't to bring it back in. I think they're just overfilled from the factory for whatever reason unless the car is absolutely babied all the time. Since it actually is a safety feature to keep from trashing your differential, it sounds like it's actually working properly as weird as that seems. Basically though, just keep an eye on it. If it's a real issue your dif will be ruined way before it's out of warranty.

 

[Sparty92]

I have a 2010, but same issue and was told the same as you basically. No big deal it just needs a little hard driving to get to the proper level (leak). I was told it should slow to a stop over the next couple thousand miles, but to keep an eye on it and if it didn't to bring it back in. I think they're just overfilled from the factory for whatever reason unless the car is absolutely babied all the time. Since it actually is a safety feature to keep from trashing your differential, it sounds like it's actually working properly as weird as that seems. Basically though, just keep an eye on it. If it's a real issue your dif will be ruined way before it's out of warranty.

They tech told me there was a TSB on this, but my car was too new (built 11/2/10, I think). He also checked the diff level and said it was fine (not too full). I went to my buddies house yesterday, who has a 5.0 that has 10K miles on it. His axle was bone dry.

I might take it in to the dealer and have them replace the valve.

 

[642mx]

1700 miles on mine and haven't noticed any leaking or any signs of what is mentioned above. I'll keep an eye on it tho.