What sealant to use on differential housing?

['68OrangeSunshine]

Here's the GM p/n for the factory 12-bolt differential cover gasket:
15634848
[Assuming you can still get them.]

[Sinister]

I'd use a gasket if I could as well. Does the top one in the link look right?
http://www.napaonline.com/Search/Res...+50014+2014024

['68OrangeSunshine]

NAPA's p/n .~...13391 looks closest. The "tell" is the 12 bolt holes. It would be easier to eyeball if they displayed the gaskets in the orientation they work in, not symmetricaly vertical, but to someone laying out a catalog [who's probably never even changed their own oil] I guess it made sense. In real life, the "fat side" is on the drivers side.
Oh yeah, in regard to the original question, I am going to use RTV Ultra Blue, since it's supposed to be oil-proof.

[Sammy]

I done some slight work on the pan (one small ding) after cleaning. Installed a gasket (none used before) used some black RTV designed for differentials (so it said on the package). Refilled after a rattle can on the cover in a light silver so I can keep an eye on it. I'll spray it back black after a while. Car show tomorrow see how it acts. Thanks for everyones input..

[SCOTI]

Originally Posted by vectorit

In reference to my post.
I posted the way "I do it" and made no reference as to silicone being a bad choice.

I have no problems with silicone, and I use it on many other gasket applications.
It's just that I found using the sealants I referenced above, and in the application method works best for me on my Eaton.

As to set up time; I tend to move slow in doing work on my burb, so if you are the type that is pit crew style of work then more power to ya. I have used my above referenced sealants in a hurry as well, and they to seal just fine with out the barley pop breaks in between. Like I said, I like to take my time. To me, all this is my therapy from my day job.

In reference to your latest question about lube; I personally wouldn't bother with the synthetics on these old machines, and just stick with the tried and true 80/90 hypoid gear oil.

JMTC

I do mine in the same fashion but use a different 'adhesive'. I use the Permatex spray gasket (copper spray) in the aerosol can.

['68OrangeSunshine]

Originally Posted by SCOTI

I do mine in the same fashion but use a different 'adhesive'. I use the Permatex spray gasket (copper spray) in the aerosol can.

That's good stuff. I use it on both sides of the L6 header/intake gasket.