Differential Cover Seal? - Diesel Forum - TheDieselStop.com
Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

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post #1 of 5 (permalink) Old 10-24-2017, 09:55 PM Thread Starter
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Differential Cover Seal?

I'm dealing with a leaky rear end cover in my 96 F350. I picked up both a Felpro gasket and a tube of blue Permatex. Anybody recommend which to use -- or both? I've heard that waiting at least overnight before pumping in lube after seal replacement is in order, too. Any thoughts?
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post #2 of 5 (permalink) Old 10-24-2017, 10:27 PM
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Differential Cover Seal?

Use both. Light coat to both mating surfaces. I use the same gasket with the Permatex black and I have the driest rear axle in the county. No need to wait overnight. I would if it was a pressurized seal, but youíll be fine on the differential.

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post #3 of 5 (permalink) Old 10-25-2017, 10:50 AM
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If either, use only the silicone, as described in this diagram & its caption:

https://www.supermotors.net/registry/media/185332 (for phone apps)


is vastly superior (and vastly expensiver), and it doesn't require any cure time before filling & driving. But according to Ford, silicone needs less than an hour. The '96 shop manual doesn't have the procedure for the heavy axles, but this is what it says for the 8.8":
Originally Posted by 1996 Bronco/F-Series Workshop Manual, Section 05-02G: Axle, Integral Carrier, 8.8-Inch Ring Gear, REMOVAL AND INSTALLATION Procedure revision date: 05/18/2000
NOTE: Axle housing cover must be installed within 15 minutes of application of the silicone or new sealant must be applied. If time permits, allow one hour before filling with lubricant to make sure silicone sealant has properly cured.

Install axle housing cover and tighten bolts to 38-52 Nm (28-38 lb-ft). Tighten the cover bolts in a cross-wise pattern to maintain axle housing cover flatness.
The torque spec for the 10.25" Rear Cover Bolt is the same.

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post #4 of 5 (permalink) Old 10-25-2017, 12:34 PM Thread Starter
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Thanks for the advice! I'll trade in my red for the black.
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post #5 of 5 (permalink) Old 10-25-2017, 01:00 PM
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I leave mine sit overnight to dry. Also waited overnight for Indian head gasket shellac to dry on the coolant hoses with recent coolant flush everything dry as a bone. If you have the time it won't hurt.

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