Not sure if the oil cooler can work w/ the clutchless fan water pump...also the 3 speed tcase has a different tooth count on the idler gears than the 4 speed, so you will need to obtain a 16 spline? 31 tooth input gear, a spacer, and a special bearing that fits the rear of the tcase housing and is sized right for the 16 spline input shaft. I know that Mark has this as a set with the new gear, spacer and correct bearing to go from 4 speed trans to 3 speed transfer. Might also check w/Georg. Keep us posted on the water pump/fan/radiator clearance issues. What alternator are you going to run?