And there's a special adapter for 26 tooth and greater gears, normally found in trucks and vans with steeper gears, and one for 25 tooth gears and under. My point was the same adapter was used in 3 & 4 speed manuals, and 904 and 727 automatics; just to make his search a bit broader. I should have been more specific, but we don't know his rear gears or tire size.