leaking 904/999

ok,,im sure this has been asked a million times,,,i have a 999/904 in my street rod,,it had a chrome deep pan,,couldnt stop the leaking,,,changed it to a non chrome steel pan,,useing the new plastic gasket with the steel gromets around the bolt holes,,,stilll leaks,,,,seems to be getting worse,, sitting over the winter,,,it has an after market dip stick,, i keep thinking it has to much fluid in it,,,im about to go to a cork casket,,and mopar tranny gasket sealer,,,
any thoughts????
i have that same gasket in my cummins truck,no leaks,,,,thought it would of been the answer,,