Before I changed over to a 4speed, I had a '65 cableshift 727 in my '65 Coronet 500. The input was changed in order to use later convertors, Cheetah valve body (revere pattern), and park system removed as in the A990 cars. Once in a while, a drip from the cable itself. Fixed that by removing the cable from the trans, removing the adjuster, cleaning with brake cleaner and carb cleaner, put rubber line over cable and filled between the cable and hose with RTV. Drier than a popcorn fart. FWIW, I'm sure that the 727 is stronger than the 833 also but not as much fun (for me).