Ford Repair: 1996 ford E350 van 15 pass, ford e350 van, speedo sensor

Question
speedomiter jumps around, do not see any type of speed senser or vacum modual, what controls speed reading?

Answer
Hi Jeff thanks for asking and sorry about the lond delay, i have been really busy.
I believe this speedometer is electronic, On the tail shaft of the transmission you should find the speedo sensor held in with one 10mm bolt, Remove that and inspect the plastic gear, if there are any teeth missing off of it then that would explain the jumping of the speedo ...
Chris p