Hi , i have a 1996 ford powerstroke 7.3 dump truck with automatic trans... about a year ago had brakes done .right after ABS light on (stays on) ,overdrive light was blinking , that stopped after having trany fluid changed. still have ABS light on and truck is not shifting properly? is this possibly a speed sensor,got that from reading on here.? is there more than 1 ? there is 1 on the read differ.. correct? is there 1 on the trany. i am not a mechanic or.. but my mechanics can't fiqure it out.. tell me its a short? any help would be great!