Lowered 2012 GT leaking pinion seal - Ford Mustang Forum

LinkBack Thread Tools
post #1 of 3 (permalink) Old 01-04-2013 Thread Starter
S197 Member
KITT's Avatar
Joined: May 2012
Location: Houston
Posts: 77
Lowered 2012 GT leaking pinion seal

I was underneath my car the other day and noticed dampness on the left side of the third member and left side axle housing. I researched pinion angle adjustment and I am assuming that lowering my car threw the pinion angle off and is creating stress on the pinion seal. In order to fix this, I can either get an adjustable UCA or LCAs. When I was first looking into lowering my car, I never read anything abt lowering creating differential housing leaks.

My question is, if I get the adjustable UCA and correct the pinion angle, will I still need to have the seal replaced? If I do, am I better off putting the car back to stock and having the dealer replace under warranty? Any help is greatly appreciated.

Btw, my car was lowered on K springs. I noticed the damp spot when I jacked up the rear end to change the rear springs to sport lines. There is no splattering of fluid anywhere under the car, so I'm assuming the leak is not severe, yet.

Black 2012 premium non-brembo mt-82

FRPP k springs (rears switched to Eibach Sportline)
FRPP dampeners
Stallion suspension Panhard Bar
JPC adjustable UCA
Whiteline Relo Brackets
Bama 93R "datalogged"
JBA 1 7/8 LTs and o/r H
Kooks axlebacks
KITT is offline  
Sponsored Links
post #2 of 3 (permalink) Old 01-04-2013
Grimace427's Avatar
Posts: n/a
There is an overflow port on the right(passenger) side of the axle that is a common leak. Make sure it's not coming from there first. I have never heard of someone's axle leaking simply because they lowered the car.

post #3 of 3 (permalink) Old 01-04-2013
GT Member
5LHO's Avatar
Joined: Dec 2011
Location: Point Roberts
Posts: 1,636
Since he says dampness on the left I'd expect it's not the overfill blowoff. However, the fill plug is on the left there and, even though it's sealed from the factory, I'd get the car up high and look at that first.

I've certainly seen pinion seals go because of misaligned driveshafts, plenty. You can see this most commonly in the jacked-up 4X4 world but it can happen going the other way, too.

The replacement is a mild pita but, you can do this yourself if you're very careful measuring the amount of threads exposed and the position of the pinion nut. Do so, undo the nut, pry the seal out, bang the new one in with a big pipe or socket to spread the load and silicone sealant around it, then return the pinion nut to its exact position. If you get this right, you won't change the pinion depth and have to pull apart the rear end. Had to do this a few times on my own old '88 5.0, waybackwhen.

2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto tune, 100 shot on BBR tune, best et: 11.4 at 120.64

2012 GT, Candy Red, Brembo, 3.73, Tech, Comfort, etc. Procal tune, Roush upper, UMI LCAs, Steeda red bracket, GT500s, 28X10X16 Hoosier slicks, best et: 11.91 at 115.23 RIP
5LHO is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Ford Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a VALID email address for yourself, otherwise you will not receive the necessary confirmation email needed to confirm, validate and activate your new AFM member account.

Failure to provide a VALID email address, will result in the cancellation of your new AFM member account registration.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On

For the best viewing experience please update your browser to Google Chrome