VSSB PIN IN/OUT 1999 GMC, 6.5TD, K2500, 4WD AUTOTRAC, BURB
Vehicles equipped with AutoTrac NP246 t-case have 3 speed sensors (VSS) one is used for VSSB the other two (front/rear drive-shafts) these 2 speed sensors work in concert with ABS wheel sensors and integrate into AutoTrac controller...