Rear pinion seal leaking 35k'ish mi. - Ford Mustang Forum
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post #1 of 4 (permalink) Old 4 Days Ago Thread Starter
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Rear pinion seal leaking 35k'ish mi.

Before our first long ride in our new Mustang and while at a friends garage (Matt's Speed Shop in Hiram, Ga.) I had the chance to lift R.J. and get a good look underneath my (then) recent purchase. While in the air I also took this opportunity to narrow down the exact location of my rear clunking (which is content for another post.)
Instead and to my surprise what I had originally put off as a sloppy u-joint grease job (btw are her u-joint even greaseable?) I learned was in fact a worn and leaking pinion seal and it was significant all over the exhaust and even the UCA was covered in it.
The next day my friend had her back up on his lift and after replacing the seal and of course a full bottle plus a part of a second bottle of gear oil and additive for the limited slip along with a real thorough cleaning (all for a very reasonable friend/regular customer discount) I was off and running.

With more than 3k miles on her since, now I know it wasn't a modification here but she was repaired correctly and her belly is clean'er so I think we can call it "good"!
Red Rebel
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post #2 of 4 (permalink) Old 4 Days Ago
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Originally Posted by RedRebel13 View Post
Before our first long ride in our new Mustang and while at a friends garage (Matt's Speed Shop in Hiram, Ga.) I had the chance to lift R.J. and get a good look underneath my (then) recent purchase. While in the air I also took this opportunity to narrow down the exact location of my rear clunking (which is content for another post.)
Instead and to my surprise what I had originally put off as a sloppy u-joint grease job (btw are her u-joint even greaseable?) I learned was in fact a worn and leaking pinion seal and it was significant all over the exhaust and even the UCA was covered in it.
The next day my friend had her back up on his lift and after replacing the seal and of course a full bottle plus a part of a second bottle of gear oil and additive for the limited slip along with a real thorough cleaning (all for a very reasonable friend/regular customer discount) I was off and running.

With more than 3k miles on her since, now I know it wasn't a modification here but she was repaired correctly and her belly is clean'er so I think we can call it "good"!
Red Rebel
See before picture:
I had mine replaced as well at fewer miles than yours



2014 GT Premium, Track Pack, Barton shifter, Borla S-type exhaust, Resonator delete, 3.73 gears, Airaid C.A.I., 93 Race Tune, JLT Oil Separator
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post #3 of 4 (permalink) Old 4 Days Ago
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It seems to be a common problem. I always add a redi-sleeve when I repair one just for extra insurance. BTW our 06 leaked at 20k and the 07 leaked at 10k miles.

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post #4 of 4 (permalink) Old 4 Days Ago
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Mine went at 32,000. Make sure the vent is clean since that is part of the problem, vent plugs and the pinion seal is the weakest point.

http://i124.photobucket.com/albums/p34/Siberexpress/Sterling/Stripes/af58edf0-2e2e-4ffe-a201-405b00a627bc_zpseb5ae052.jpg
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