I'm working on a friends '97, 4X4, Cummins, Automatic. The ABS light comes on intermittently. I checked all of the connections of the sensors and all looked good. My 2001 manual either doesn't address the ABS system or I didn't look in the right place. Does the sensor at the rear dif. crap out like Fords? This guy is going on a long trip soon and I would like to fix it for him before He goes. Any help much appreciated!!! Chris