I have a 99 2.5L Ranger and randomly the ABS light comes on while driving. This is usually while I am on the freeway, not sure if that is just a coincidence or not but seems to only happen at higher speeds. I was reading and many suggested issues with the sensor on top of the rear diff and it possibly causing speedo issues as well. When I bought my truck it had a bad speed sensor and the speedo didn't work. A replacement was bought at AutoZone and installed. The speedo works now but doesn't come on til @ 30mph. The light doesn't come on when starting the truck, and when it does come on its usually only for a few mins then it goes away.
Any input is greatly appreciated!