rear axles

ABS Light came on 3 months ago. (96 XLT Ranger, 3.0L, Rear ABS, 7.5 RG) I was driving down the road (SC) when the rear Pass wheel locked up and left a line of tread 50' long and dug into the shoulder (dirt) when I pulled over. I turned off the engine, then turned it back on, and the wheel was...