Change gear oil in a 12 bolt

[396 SS/RS]

Originally Posted by Rsconv68

IIRC, all 12 bolt rear axles were not automatically a posi traction.

That is correct.

[big gear head]

Originally Posted by Too Many Projects

Draining the old, used oil, is the strongest and worst, smell and there is no way to avoid getting that smell in a building, unless it is drained outside. The new oil, almost, smells good, compared to the old "stuff"...

When I had my rear end shop I smelled like that every day for 15 years.

[BJCHEV396]

Originally Posted by BJCHEV396

Hi guys,I've never changed the oil in the 12 bolt of my Camino.Would 2 quarts of 80w90 and a 4 oz.bottle of posi additive be enough?Thanks,Bill.

And to seal it up...use just a quality gasket with or without silicone?

[Too Many Projects]

Originally Posted by BJCHEV396

And to seal it up...use just a quality gasket with or without silicone?

I don't use silicone with a gasket...just lets the gasket slip out of place as you tighten the bolts.
And, yes, a good gasket alone.
Both surfaces white towel clean with acetone and dry.

[big gear head]

I put a film of RTV on both sides of the gasket. You will hear 20 different ways of doing it. Some people have completely quit using gaskets, but that didn't work out too well for me.

[Too Many Projects]

Originally Posted by big gear head

I put a film of RTV on both sides of the gasket. You will hear 20 different ways of doing it. Some people have completely quit using gaskets, but that didn't work out too well for me.

THAT is the key, a barely visible film, but too many people gob it on and create leaks.
When I use RTV, the only one I use is Ultra Black gasket maker, and Freddie's extensive experience is right, applied correctly, it is helpful. Next step for me, is, it needs to "cure" for 24 hours before I will introduce any fluids too.

[Zman1969]

Originally Posted by Too Many Projects

THAT is the key, a barely visible film, but too many people gob it on and create leaks.
When I use RTV, the only one I use is Ultra Black gasket maker, and Freddie's extensive experience is right, applied correctly, it is helpful. Next step for me, is, it needs to "cure" for 24 hours before I will introduce any fluids too.

YES!
it needs to "cure" for 24 hours before I will introduce any fluids too

[SS427]

I have more often than not had leaks in my 12 bolt cover, with or without gasket, with or without black RTV. That is until I started using Permatex's 81182 Gear Oil gasket maker. I still use the gasket but put a thin layer of this on both sides and have not had a leak since. Like others have stated, give it overnight to set and you will have no issues.

[Too Many Projects]

I have never seen that product, Rick...
I'll be getting a tube of that to have on hand.
Thanks !

[BJCHEV396]

Thanks for all the tips and info!