'93 N/A E4OD. Bought the truck and thought the trans valve body needed rebuilt and speedo didn't work. New vss really improved trans but hard 1-2 shift and bump in and out of OD over 65mph. Also speedo erratic over 50mph. 2nd vss same problem. Week later tach guage at 0 until engine warm up, only on really cold mornings. Another week tach at 0 permanently and trans in limp. Replaced tach sensor same problem. Anyone with fresh ideas appreciated, thanks