I finally found a Turbo 400 w/reverse valve body, I have never had one of these in a boat. What can I expect from the 400, this is kinda what I thought, my be there is more. This would be for a 20.5 Campbell w/ 454 Bravo, 380hp, Champion v-drive 15 over low first gear to idle by the docking area, and to idle up to 2nd for Wake boarding, Tubing,Surfing, Skiing. And 3rd gear for high speeds. The Reverse is the same as any other transmission? Park is very nice to have to Remove and install propellers and for safety when someone is in the water,(skier ,boarder,tuber, surfer) the prop is locked up.