I have a kit for the 50 series on my M52. You will need a regulator,flapper valve and fittings to pressurize the bellhousing first. This keeps the clutch dry so it won't slip. You will also need to plumb a vent tube from the sprag shifter valves on top of the tranny. So water won't enter and keep the transfercase sparag fromworking. Also you will need a vent tube from the brake booster air pack to keep water out when the brakes arn't applied. install it where the air vents when the brakes are released. There are one way air vents on the axles, tranny, and transfercase. But they rarely work. Put vent lines up higher on those.