I need to put a new trans. pan gasket on a 727 and was wondering what gasket is recommended these days. It's been probably 20 years since I last changed a trans. gasket and at that time I tried one of the Mopar rigid, reusable gaskets and it leaked quite a bit so I think I'd rather try a conventional cork or rubber type gasket. Recommendations?
The only reason that gasket leaks is because the pan is not flat. Or a crack in the flange of the case.
Lay the pan on a very flat surface. You will probably see some or all of the bolt holes bell mouthed. Flatten them out.
You should not be able to get a feeler gauge of more than .013” (if memory is correct) between the flange and surface.
Don’t use any sealers, just clean the trans and pan with thinner and bolt it together.
You can’t over torque this gasket, you will just strip threads.
