The transfer case has three speed sensors. The first sensor is located on the front output shaft, and the second is located on the rear. The third sensor is the vehicle speed sensor, from which signals are sent to the PCM. The third sensor is also located on the rear output shaft of the transfer case. All three sensors are variable resistance sensors from which AC voltage signals are received. As the speed increases, the frequency and magnitude of the alternating voltage of the sensor signal increases proportionally.
The procedure for checking the functionality and replacing the transfer case output shaft speed sensors is basically similar to the procedure for a car speed sensor. Refer to chapter section «Vehicle speed sensor - replacement».