what size is the o-ring that goes on the dipstick to seal it on a th350? my trans drips a little fluid out of the dipstick tube hole.. im assuming this is because of a bad o-ring because thats all i can think of, although the o-ring looks good no tears or nothin... is it possible that it has shrunken? anway does anybody know what size that o-ring is or any other way i can make it stop leaking? its really annoying.

 

Just put a lil RTV on the mating surface of the dipstick tube/tranny. That will keep it from leaking...

Rick

 

already tried but and it didnt work.. im guessin it was because the trans was full and the surface wasnt clean enuf.. oh well looks like i gotta take the cross member off drain the fluid n try again