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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jan 2016 Posts: 1,101 'Bolter | | 'Bolter Joined: Jan 2016 Posts: 1,101 | I am going to change the oil in my rear differential. I am not sure if I can come up with a replacement gasket. If not, what gasket in a tube do you guys use. Will just the gasket silicone stuff in a tube work by itself as a gasket. The common Permatex brand comes in the blue and black. Which would be best for the differential cover. | | | | | Joined: Oct 2021 Posts: 6,926 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 6,926 | I figure if Permatex Grey or Black works on intake manifolds, it's probably fine for a rear diff.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
| | | | | Joined: Sep 2009 Posts: 5,980 Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT | | Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT Joined: Sep 2009 Posts: 5,980 | Dave, Rock Auto has the gaskets available: Differential cover gasketDan EDIT: Moved this to the "Driveline" forum for further discussion as the better forum for subject.
Last edited by Gdads51; 04/04/2023 2:17 PM. Reason: Relocation of thread to Driveline forum
~ Dan 1951 Chevy 3 window 3100Follow this story in the DITY Gallery"My Grandpa Carl's Truck and How it Became Mine"1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
| | | | | Joined: Jul 2000 Posts: 2,200 Insomniac | | Insomniac Joined: Jul 2000 Posts: 2,200 | I suppose you could just suck out the old oil like the quicky oil change places do....
Gord 🇨🇦
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1954 1/2 ton 235 4 speed
| | | | | Joined: Jan 2019 Posts: 2,242 Herder of Cats, Goats, and Sheep (moderator) | | Herder of Cats, Goats, and Sheep (moderator) Joined: Jan 2019 Posts: 2,242 | I have used permatex black for decades without any issues. It is harder to clean off than a gasket the next time you open it, but it also doesn't leak after a year or two. | | | | | Joined: Jan 2016 Posts: 1,101 'Bolter | | 'Bolter Joined: Jan 2016 Posts: 1,101 | I was considering sucking out the old oil but I guess this would be a good opportunity to get the sludge out and inspect the gears. I also hope to never have to do it again. I don't think I will be around when it is due for a change in 50 years. | | | | | Joined: Feb 2004 Posts: 29,851 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,851 | It only takes a few minutes to whittle out a rear cover gasket, using a file folder, scissors, and an X-acto knife or box cutter. Brush on a coat of Permatex Super 300 for sealer. I used to use sharpened .38 Special cartridge cases to cut out bolt holes, but now I've got a gasket punch set.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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Love your enemies and drive 'em nuts!
| | | | | Joined: Oct 2012 Posts: 340 'Bolter | | 'Bolter Joined: Oct 2012 Posts: 340 | Permatex "green" is for gear oil, but as others have said grey or black will work also
1936 GMC T-14 restro-mod
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