Have a 1963 Chrysler Newport. Been sitting for 25 years. Transmission shifts good into reverse, 1st and 2nd. Does not want to shift into 3rd gear. Fluid is at the right level. Searched other forums and it seems the most common failure would be the seal on the 1st/reverse servo. It that the place to start? In research, it seems the older 727's have a different servo and takes a different seal. Any place have this seal? Thanks
