Just got this car recently and the sdeedeomoeter is not working. What are some things to look for and what to check.?? Also how can I tell which Muncie 4 sp.I have 20/21/22???

Two things about the speedometer. First, it may not be "plugged in" to the back of the speedometer in the dash. Second, the little plastic gear in the tranny may be stripped. A third thing could be the cable has been cut or something. Others with more experience will offer better suggestions, I would suspect.