NP247 Transfer Case Drive Chain HV-071 for Jeep Grand Cherokee

This is an HV-071 replacement drive chain for the New Process NP247 transfer case, the full-time Quadra-Trac II unit used in the 1999-2004 Jeep Grand Cherokee WJ. The chain is 1.00 inch wide and links the rear output shaft sprocket to the front output sprocket, so it carries every bit of torque that goes to the front axle.

Why it gets replaced: NP247 chains stretch with miles, and a stretched chain starts slapping the inside of the case. You hear it as a knock or rattle on takeoff and when you let off the throttle, and in bad cases the chain jumps teeth on the sprocket under load. Once it slaps long enough it wears through the case halves, so it pays to catch it early. Metal in the transfer case fluid and a rattle that follows vehicle speed are the usual signs.

On the bench: drain the case, pull the front and rear driveshafts, and remove the transfer case from the vehicle. Take off the rear extension and the gerotor pump, then split the case halves. Lift the chain, front sprocket and front output shaft out together. Check both sprockets for hooked or worn teeth and replace them if they are damaged, since a new chain on bad sprockets wears quickly. Fit the new chain over both sprockets, reassemble with fresh RTV and seals, and refill with the correct NP247 fluid.

Compare the HV-071 number and chain width to your original before ordering.