Re: 1932 902 differential

Posted by Tim Cole On 2011/11/15 17:34:58

Dear Curtis:

Modern cars are using sealer as the only gasket for differentials and so I have complete faith in the better products. One sealer that is really good is Chrysler ATF RTV Transmission Silicone Sealer. It cures in the presence of transmission oil and is used on tranmission covers sans any gasket. Another good one is Permatex Super Blue and Permatex Right Stuff. I have been able to use the products to make non-pressure dynamic seals which means they are really good.

To make sealers work, the surfaces need to be meticulously cleaned and free of high burrs and old gaskets.

A method I use on tough jobs like the Packard Ultramatic is to screw everything together snug and then let the sealer cure for 24 hours or more. Then I torque the parts and compress the sealer for an impervious gasket.

For your differential you don't have to worry about pre-loads because the unit is a 3/4 floater and comes out as a unit. A 1/64th inch thick gasket (.015) is the best but 1/32 (.030) will do. You can get these via the Felpro catalogue from NAPA etal, or online from McMaster-Carr.

And yes I would use sealer to put the parts back together even with gaskets.

Hope everything here helps.