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Old 06-29-2007, 09:21 PM   #1
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Default Diff Fluid?

Hey guys I have a small leak in the Diff and Im going to get it fixed. I was wondering what is the best Oil for it? and What did you guys use (sealant, caulking, etc) to have it not leak anymore. Did you use the standard gasket from NAPA or Autozone? Hans says he uses some kind of Caulking. I would like to know so I can repair it tomorrow afternoon. I hear Cobras tend to have this problem. This might be due to no IRS brace installed but, I have the Brace and waiting to put it in.
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Old 06-29-2007, 10:04 PM   #2
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Originally Posted by 01SVT19 View Post
Hey guys I have a small leak in the Diff and Im going to get it fixed. I was wondering what is the best Oil for it? and What did you guys use (sealant, caulking, etc) to have it not leak anymore. Did you use the standard gasket from NAPA or Autozone? Hans says he uses some kind of Caulking. I would like to know so I can repair it tomorrow afternoon. I hear Cobras tend to have this problem. This might be due to no IRS brace installed but, I have the Brace and waiting to put it in.
Its all about peace of mind...I have heard of people using the the silcone to seal the leak and it takes care of it but I didnt feel comfortable with what I considered to be a "temp fix"...but thats just me. I went thru and just had my seal replaced all together...... From what I have read sometimes the bolts on the cover "loosen up" and will end up causing the leak??
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Old 06-29-2007, 10:39 PM   #3
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Use the Ford Motorcraft Diff Fluid and friction modifier. Supposedly thats the best stuff.
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Old 06-29-2007, 10:55 PM   #4
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Use the Ford Motorcraft Diff Fluid and friction modifier. Supposedly thats the best stuff.
Where can that be purchased? Do you know how much it goes for?
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Old 06-29-2007, 10:55 PM   #5
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Its all about peace of mind...I have heard of people using the the silcone to seal the leak and it takes care of it but I didnt feel comfortable with what I considered to be a "temp fix"...but thats just me. I went thru and just had my seal replaced all together...... From what I have read sometimes the bolts on the cover "loosen up" and will end up causing the leak??
Where did you buy the new gasket/seal? What silicone you used? Thanks for the input.
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Old 06-29-2007, 11:06 PM   #6
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I use Royal Purple in most of my diff builds. It already has the additive in it and works really well. As for the cover seal, there's the right way to do it, and the other way. Be smart and replace the gasket. The trick is what you use with the gasket. Diff covers and transmission pan gaskets should never see silicone. The shit can get squeezed into the inside of the unit and cause big problems.
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Old 06-29-2007, 11:29 PM   #7
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you still didnt fix that heap?
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Old 06-29-2007, 11:34 PM   #8
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How bad is it leaking? Just a heads up, I cracked mine and after a night it would leave a quater sized puddle of gunk. I had the Billetflow IRS brace on my car.
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Old 06-30-2007, 12:03 PM   #9
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I use Royal Purple in most of my diff builds. It already has the additive in it and works really well. As for the cover seal, there's the right way to do it, and the other way. Be smart and replace the gasket. The trick is what you use with the gasket. Diff covers and transmission pan gaskets should never see silicone. The shit can get squeezed into the inside of the unit and cause big problems.
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Old 07-02-2007, 06:57 AM   #10
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Originally Posted by 01SVT19 View Post
Where did you buy the new gasket/seal? What silicone you used? Thanks for the input.
I would just go to Ford and get a gasket from them....I also agree with the other guys on choice of fluid I have the RP in the dif and no issues.
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Old 07-02-2007, 07:10 AM   #11
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there is no gasket for the cover on an irs car. nor should there be as the rear cover is also the rear mounting point.

i use aviation gasket sealer. the brushable kind.
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Old 07-02-2007, 07:13 AM   #12
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03 and up Cobras, and I assume the rest of the 8.8's, no longer use a gasket. They use silicone sealant only.
The problem is that the IRS tends to loosen the bolts holding the cover onto the differential and have to be re-torqued periodically.

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Old 07-02-2007, 08:20 AM   #13
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The problem is that the IRS tends to loosen the bolts holding the cover onto the differential and have to be re-torqued periodically.

Dan
I take it having the IRS brace cover on the dif helps the loosing of the bolts?
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Old 07-02-2007, 08:54 AM   #14
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I take it having the IRS brace cover on the dif helps the loosing of the bolts?
Maybe to a limited extent, but the case is still aluminum and the bolts will still loosen up periodically. It is recommended that after hard use, such as a trip to the strip, the bolts be checked.
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Old 07-02-2007, 09:02 AM   #15
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Maybe to a limited extent, but the case is still aluminum and the bolts will still loosen up periodically. It is recommended that after hard use, such as a trip to the strip, the bolts be checked.
Touque requirements for the bolts?
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Old 07-02-2007, 10:47 AM   #16
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Differential housing cover bolt 24 ft/lb
Rear axle differential rear insulator bolt 76 ft/lb

SAE 75W-140 High Performance Rear Axle Lubricant
Rear axle lubricant 2.9 pints + 4 oz. friction modifier

Clear Silicone Rubber (Ford number F7AZ-19554-CA) This is not the same as RTV.

All the above is from the Ford Service manual.
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