Doug, Just a note that may help clear up the transmission and speedo gear you are talking about. From your
earlier post on the speedo subject, your pictures show your transmission is an SM420. Calling it a "Muncie" makes folks think it is a later 4 speed like the info mentioned in cmayna's reply above. That won't get you the right speedo gear unfortunately.
Can you tell us what the tooth count is on the gear you have? I recently came across a source that had a few possibly correct speedo gears that may have solved your problem, but unfortunately I found this morning that they sold out.
Give the tooth count on the one you have anyhow and folks can try and point you in the right direction.
