Drive Train Axles Bearings problem
1998 Ford Ranger 6 cyl Four Wheel Drive Automatic 83000 miles
the 4wd high light comes on but the 4wd low doesnt, 4wd doesnt engage in either case. Had some problems last winter with it engageing intermitantly. When it did it wa an audible thud you could hear and feel.
It sounds like the actuator is going bad. It is the electric motor on the transfer case that engages the 4wd. When this happens, check to see if there is power to the actuator. IF there is, chances are it is bad.