99 ranger abs

[harperf06]

Hello I am new to this forum but am desperate for help. I have a 99 ranger and the abs light is on speedo doesn't work o/d light flashes and it shifts hard. I have already replaced the speed sensor on the rear end twice thinking maybe the first one was bad. I've checked all the wires and connections and cleaned them and coated in dielectric grease. Can anyone suggest something different? Also the 4x4 flashes not sure if that's related tho.