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Senior Member
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8,265 Posts
Discussion Starter #1
I just received my 08-10 rear diff cover for the Excursion. I took a quick look at it, and saw that there is gasket groove in the cover. Is there supposed to be a fitted gasket or "ring" that goes into this groove? I was just planning on using hi-temp rv stuff (like what I used on the rear of my 99) but wondering about the gasket.

Thanks in advance
 

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Junior Member
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3,533 Posts
Loctite 5699 High Performance RTV Silicons Gasket Maker. That is what class eights, use to seal in the pumpkin and it is great stuff. I use it on Cummins 5.9/6.7 front covers, and everywhere else you would ever use silicone.
Clean the surfaces with Var-sol, leave it a little damp install the silicone wipe the diff housing with a towel wet and rung out with var-sol and assemble it. The var-sol reacts with the silicone and when it drys it draws the silicone in.
Also works on pedal pads that fall off, front axle bump stops.
 

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Stuck in Commiefornia...
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1,296 Posts
Sounds good but a little permanent. Permatex Ultra Grey works excellent as a gasket maker, forms a solid rubber like seal and is what I used on mine. Clean dry surfaces and a 1/4-3/8 diameter bead of the gasket maker are all you need. I put it on the cover surface and let it sit for 3-5 minutes before assembly.

Cool thing with Ultra Grey is if you want an actual gasket for anything with a flat face, you can make one, a good one, with the stuff. You stretch out some cling wrap on a/the box. Then get some 1/16", 1/8", or 3/16" washers to set the gasket's finished thickness. Set the part face down on the smooth cling wrap and let the washers hold the part up by it's edges over the cling wrap. Let it cure for 8-12 hours, and you have a 1/16", 1/8", or 3/16" rubber gasket attached to the part.
 
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