NP242 Transfer Case Drive Chain MG10-063, Morse HV-063

A stretched drive chain is the most common wear item inside a chain-drive transfer case. As the links elongate the chain rides up on the sprockets, slaps the case, and eventually wears through the housing. Symptoms are a grinding or rattle that changes with throttle, a clunk going in and out of 4WD, and a delay before the front axle picks up.

This Motive Gear MG10-063 is a direct replacement for the Morse HV-063 chain used in the New Process NP242 and NP242DHD, plus NP236 and NP246 applications that call for HV-063. Check the part number stamped on your old chain or confirm by case ID tag before ordering, since these cases used more than one chain over their production runs.

Install with the case split: remove the rear half, lift the chain and front output sprocket off together, and inspect the sprocket teeth and mainshaft bushing before fitting the new chain. Replace the case seals and refill with the specified fluid at the same time. If the chain has already cut into the case, check for a hole in the housing before reassembly.