Hi.I have a 94 250 4x4 xlt,well I stopped into a store shut off came out started up and the abs light came on,ok,didn't worry about it,until I took off.Sppedo went nuts needle going all over,tranny shifted like a drag car,slamming in gear(e4od) no overdrive.drove 5 miles home,thought tranny was coming apart.Tested sensor in rearend open circuit,replaced,damn truck ran better then before it happened.That thing can cause a lot of issues.abs light didn't flash just stayed on steady and went out after new one installed,the old part was 24 years old.Thought I would share this issue