I am not sure which forum to post in. I have an 87 TS6M Comp, we rebuilt the motor. I have PP Star gazer and we ski buoys at a tournament site at around 5800 ft above sea level. I have the Borg Warner Velvet Drive 1:1. I would like to swap out the transmission with a 72C or equivalent with a 1.52:1 gear reduction for better performance. Does anyone know what transmission options came at that time and what is the correct replacement? I know there is not enough room for a 72C, it needs nearly 18 inches.