I just did a boat load of work to my '95 F150 5.8 5speed(conversion) 4x4. I took it for it's first drive after the work, the list of which would exceed this block's word limiit, and the speedo became erratic. The needle jumped from what seemed to be an accurate speed to lower speeds. The needle jumped more as speed increased, becoming most noticeable above 65 M.P.H. The only problem was the needle, and nothing else seemed to be affected. My cruise control no longer works either, but that could be due to some harness wire jumping to eliminate the old auto's wiring and control. Any help much appreciated. I did change the speed sensor in the rear but not the one in the transfer case. Which one actually controls the speedo? I think the rear is just for the ABS.