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2005-2010 Mustang GT Tech Forum

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Unread 11-18-2007   #1 (permalink)
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Default 2006 Mustang GT Rear Differential Leak

Noticed a lot of oil like stains under the back of my car. While I was getting my oil changed, the people told me my rear differential is leaking pretty bad.

Any ideas on why this would happen? How big of an issue is this?

I'm just dreading having to deal with my local ford dealership. Arg!

Thanks.
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Unread 11-18-2007   #2 (permalink)
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Could be a couple of things. Might be the diff cover seal. That's an easy fix. Or it could be the vent tube on the top of the axle (little silver cap on passenger-side). That leaking is not terribly abnormal.
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Unread 11-18-2007   #3 (permalink)
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Could be a couple of things. Might be the diff cover seal. That's an easy fix. Or it could be the vent tube on the top of the axle (little silver cap on passenger-side). That leaking is not terribly abnormal.
Now if its the pinion seal then thats a different thing. I would have the dealer replace the seal.
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Unread 11-18-2007   #4 (permalink)
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Now if its the pinion seal then thats a different thing. I would have the dealer replace the seal.
Could be... I've had two fail.
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Unread 11-24-2007   #5 (permalink)
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I've had both leak, both my fault. The cover is easy to do and having the dealer replace the pinion seal only cost around $100.
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Unread 11-24-2007   #6 (permalink)
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I've had both leak, both my fault. The cover is easy to do and having the dealer replace the pinion seal only cost around $100.
How did you damage the pinion seal?
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Unread 11-24-2007   #7 (permalink)
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F#&$ing around with the pinion angle trying to get an aftermarket drive shaft to work which was causing panel ejecting vibrations. One of my last attempts I over adjusted the p/a to 2*+. Took a drive for a couple of miles and started hearing a bad sound from the back. Pulled over, looked underneath and it was too late, already leaking. I ended up stretching the cover on the OEM flange and messed up the seal.
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Unread 11-24-2007   #8 (permalink)
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F#&$ing around with the pinion angle trying to get an aftermarket drive shaft to work which was causing panel ejecting vibrations. One of my last attempts I over adjusted the p/a to 2*+. Took a drive for a couple of miles and started hearing a bad sound from the back. Pulled over, looked underneath and it was too late, already leaking. I ended up stretching the cover on the OEM flange and messed up the seal.
How come you're running a positive angle? I was always told for a street/strip car -1 to -2* and -2 to-3* for a track-only car.
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Unread 11-25-2007   #9 (permalink)
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my rear cover leaked cause I jacked my car up from the center of the housing....now thats a no/no. I always jacked up my 69 with the 9" that way....never thought anything of it on the 06. had to have it resealed.
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Unread 11-25-2007   #10 (permalink)
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Originally Posted by stlwagon View Post
How come you're running a positive angle? I was always told for a street/strip car -1 to -2* and -2 to-3* for a track-only car.
'Cause nothing else worked and that was the last angle I hadn't tried. So much for that, huh? I'm now running the Spyder at -1.5* with no problems. I actually got a full refund for the other DS.

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my rear cover leaked cause I jacked my car up from the center of the housing....now thats a no/no. I always jacked up my 69 with the 9" that way....never thought anything of it on the 06. had to have it resealed.
That's how I sprung a leak on mine, however, only because the jack put pressure on the cover. Now I'm more careful to ensure the jack is lifting just behind the cover. I lift it up by the housing everytime I need to get the ass end up.

This is on my short list of things to get. As soon as gears go in, this is going in too.

LPW Low Profile Diff. Cover and CHE Axle Brace Combo [LPWCHECOMBO] - $346.94 : Piedmont Modular Performance, Specializing in late model Mustangs
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Unread 11-25-2007   #11 (permalink)
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'Cause nothing else worked and that was the last angle I hadn't tried. So much for that, huh? I'm now running the Spyder at -1.5* with no problems. I actually got a full refund for the other DS.



That's how I sprung a leak on mine, however, only because the jack put pressure on the cover. Now I'm more careful to ensure the jack is lifting just behind the cover. I lift it up by the housing everytime I need to get the ass end up.

This is on my short list of things to get. As soon as gears go in, this is going in too.
It look like your on top of it and got a good plan in the works.
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Unread 11-25-2007   #12 (permalink)
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I have this setup... It's very nice. The axle brace is a bit of a pain to install. Put it on a lift. I assume you have an auto hobby shop over there?
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Unread 11-25-2007   #13 (permalink)
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I do, but do most of my work in the garage. But since this needs drilling, I'm sure it's easier on the lift. I need to find it if it works with the BMR relocation brackets. Do you know?
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Unread 11-25-2007   #14 (permalink)
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I do, but do most of my work in the garage. But since this needs drilling, I'm sure it's easier on the lift. I need to find it if it works with the BMR relocation brackets. Do you know?
There's no drilling required. Your diff housing should already have the holes. Only early 2005 models need drilling.
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