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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: Jul 2022 Posts: 92 'Bolter | | 'Bolter Joined: Jul 2022 Posts: 92 | Probably a silly question but.....do you folks use a shellac or other gasket sealer when installing the gaskets on the rear end cover? I haven't done much wrenching in the past 20 years, but back in the day I remember using the shellac as well as just RTV silicone. What is considered correct? | | | | | Joined: Nov 2012 Posts: 21 'Bolter | | 'Bolter Joined: Nov 2012 Posts: 21 | I don’t know about the more experienced members but I just replaced the gasket on my differential cover and it still leaked! Prior owner didn’t even have a gasket- just some gasket material. I took the cover off, and applied some gasket adhesive to the cover side of the gasket and it sealed it up. I use 3M Yellow Super Weatherstrip and Gasket Adhesive. I also had to replace all my bolts as they were stripped at the threads to torque properly (I think it’s 30-50 foot pounds
1951 GMC with positive ground. Engine is a ‘54 Chevy passenger car (Serial Number 0024472F54Z) with a ‘56 head (casting code on top of head 3836848 GM 4), Casting Code (on passenger side on side of head B56 848 850)
| | | | | Joined: Sep 2011 Posts: 1,453 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 1,453 | . I also had to replace all my bolts as they were stripped at the threads to torque properly (I think it’s 30-50 foot pounds No wonder bolts failed, way to tight.
BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
| | | | | Joined: Apr 2007 Posts: 1,038 'Bolter | | 'Bolter Joined: Apr 2007 Posts: 1,038 | Agree that 30-50 foot pounds is too tight and likely distorted the cover. 20-30 foot pounds would be more like it. Also, since the bolts go into the differential carrier, it is important to put sealant on the bolt threads to keep gear oil from seeping out. One product I like for this application is Permatex "The Right Stuff". I know, a stupid name but this is a type of sealant that works better than routine RTV. You don't get the seepage later on. It has more adhesive qualities than regular RTV so I wouldn't use it where you routinely remove the part for maintenance.
Kent | | | | | Joined: Feb 2026 Posts: 15 'Bolter | | 'Bolter Joined: Feb 2026 Posts: 15 | On the rear end cover I use a gasket and a sealant. I had been using a silicone RTV type, and recently I started to use Permatex Aviation form-a-gasket sealant liquid. I figure if it is for use in Aviation applications it will work well in Automotive. Absolutely do not get it on anything other than on the gasket or metal part, it is very difficult to get off your skin, so I suggest wearing gloves. It's a brown liquid much like the old Indian Head gasket sealer. 25-30 pounds torque on the bolts should be sufficient.
1938 half ton pickup
1938 half ton pickup
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