I have a 75hp 1983 sea horse slipping out of reverse gear, I adjusted the linkage thought i fixed it and now it slips..i think the clutch is worn in reverse..i want to know if it is possible to replace a clutch dog without dropping the lowere unit ..in the manual the only thing that could stop me that i see is the pin...i dont have to fix the forward gear...is this possible p.s 120psi on all 3cyl