Rocketman6768

Feel dumb asking but would like to get direction regarding the best method for sealing a tranny pan on a 72 Cutlass S. Gasket? RTV? Combo? If gasket, cork or rubber? Other than using a torque wrench to ensure uniform tightening, any other advice/tricks to maximize chances of a leak free repair?

Appreciate any assistance!

Fun71

When the pan is off, flatten the areas around the bolt holes. Hammer and piece of wood supporting the pan rail.

joe_padavano

^^^THIS! The factory torque spec on the pan bolts is 13 ft-lbs. Gorillas like to crank on the bolts in an ill-fated attempt to seal the pan, which locally crushes the thick cork gasket, deforming the pan rail.

Olds64

Make sure you use a high quality gasket.

https://www.summitracing.com/search/...n-model/thm350

You can use Permatex if you want, not RTV.

joe_padavano

I've found those LubeLocker gaskets to be among the best, both for trans pans and rear axle covers.

droldsmorland

When you get your new pan with the drain plug option (highly recommended) and gasket, glue the (standard cork or composite) gasket to the pan with your favorite spray adhesive (permatex high tack) then bolt it up with nothing on the trans case.
Both of these suggestions make the next service a breeze.
I use either composite or rubber steel core pan gaskets. Can reuse the rubber steel core multiple times, No glue needed on this one. Same strategy works well with valve covers.

https://www.jegs.com/i/Moroso/710/93103/10002/-1

All I can find for an image is this chineasium junk. I know OEM stock smooth steel pans exist with the drain.

https://www.jegs.com/i/JEGS/555/601181/10002/-1

Drain plug kit:

https://www.ebay.com/itm/125642989350

Koda

Lube Locker gasket and good torque pattern to spec, along with flat pan, does it. My 72 Olds is bone dry, my 67 leaks badly, I've improved my method.

bccan

Lube Locker or Duraprene gaskets are my favorites.

Rocketman6768

Lube Locker it is! Sounds like several of you have had first hand experience with them. I'm hearing the gasket alone (minus Permatex) should do the trick especially if I grab a new pan and drain plug as well. Thanks for all the guidance!!

joe_padavano

I would be wary of new aftermarket pans, especially Chinesium chrome ones. Flatten the rails on your OEM pan for best results.

droldsmorland

What Joe said X10.
I had to call TCI and ask for an OEM USA pan. They rebuild cores daily. Good used GM OEM examples are abundant.

As Joe and others mention if its in good shape and the pan rails just need a little love with a ball peen on a flat surface you are far better off.
Just install the drain plug kit. Use a light coating of "The right stuff" RTV on that.

If you have to straighten your pain rail, be gentle. You need to concentrate on the bolt hole areas. Just want too bring them back to level. Be careful to not flatten the raised gasket pinch feature.
Put the pain on a flat surface and inspect. If its wrapped it will be captain obvious. Ive had success using a large flat drift. Or the square drive end of a impact socket with a larger socket on the other side for support.
Many ways to do this successfully. Just don't meat-hook it gorilla style.

No chineasium junk...EVER!

matt69olds

The place I buy transmission parts sells OEM deep pans, filter bolts and the longer filter pickup tubes for 30 bucks. I like the late model factory pans because they are cheap, they work, and include a raised bead around the pan surface.

It’s rare to get a stamped steel shallow pans in useable condition. They are usually beat to hell or rusted out.

The charcoal colored gaskets, or the shiny tan gaskets that come in TranStar gaskets kits are without a doubt the best gaskets I have used. I don’t know what they are made of, or if the have a coating, by it takes a couple good hits with a rubber mallet to break the pan loose.


Regardless of the type of pan, the surface needs to be flat. A little hammering will go a long way. If it’s a chrome pan, junk it! Some people say grinding the chrome from the pan will help it seal. Not in my experience!

Olds64

Summit, Jegs? Nah, even their Chinesium stuff is more expensive than that. Do tell...

matt69olds

Teal Automotive in Dunkirk Indiana. 1-(800) 722-0215. They specialize in new, used, and refurbished transmission hard parts.

Call, ask for Cheryl. When she answers, be sure to call her a loser slacker foolish woman, i guarantee she will know EXACTLY who referenced them 😁😁

They ship all over the country, I don’t know what shipping would cost on a 400 deep pan and related hardware. Might be worth looking into.

Olds64

Thank you, sir. I'll have to order some swag from them.