Silverado 2500HD 2001-2002 Transfer Case Motor 600-907

This shift motor fits 2001-2002 Chevrolet Silverado and GMC Sierra 2500, 2500HD and 3500 trucks with the New Process NP263 transfer case. That covers the 6.0L and 8.1L gas engines, the 6.6L Duramax diesel, the 6.0L CNG engine, and the 5.3L in the Silverado 2500. It replaces GM 12478096 and crosses to Dorman 600-907. It comes with the pigtail harness, a 6-pin rectangular connector and a 2-pin oval connector.

The motor bolts to the side of the transfer case and turns the shift shaft. It also has a position encoder that tells the transfer case control module which range the case is in. When the motor or its encoder fails, the truck will not shift into 4HI or 4LO, the 4WD lights on the switch flash or stay on, the Service 4WD message comes up, or the case stays in the last range it was in.

Rule out the simple causes first. Check the transfer case fuse, look for corrosion or bent pins in both connectors, and check the selector switch on the dash. If the motor gets power and ground but does not move, or the encoder reading does not match the range, replace the motor.

When you swap it, put the truck in 2HI with the engine off. Note the position of the shift shaft on the case and line up the new motor's drive with it before you bolt it down. If they do not line up, the motor will not sit flat against the case.