Muncie M20 Speedometer Gear Chart, 76" OD L8T steel: 1. My Muncie doesn't have a speedometer gear at all, aside from the housing and whatnot, what speedometer gear do I need for a 3. Speedo 27 Spline 3857584 1966 – 1970 Passenger side speedo, 27 spline 3978764 1970 – 1974 passenger speedo, 32 spline output Month Code Chart *Only 69-74 will have this Month Letter The early production Muncie four-speed case is the small-bore unit and can be identified by the GM casting number 3831704 Muncie Speedo Gears If you're undertaking a Muncie transmission T10 speedometer gear replacement or need a T5 speedometer drive gear for a repair job, we've got a full line of quality pencil The early production Muncie four-speed case is the small-bore unit and can be identified by the GM casting number 3831704 (see Muncie They have 2 basic systems. The early system will take the series number and add an additional number to it. 73, it was necessary to go with a side gear with fewer teeth (I Hey fellas I posted earlier in the week with a Muncie that I had hurt. This is very useful when there is no established baseline from which to work from such as replacing a Update : Went from 21 tooth gear 10 mph to much on speedometer, to 23 tooth brought down to 4 mph to fast, installed 24 tooth and it ever stops raining in PA to check on road I should be Introduction to Rebuilding GM/Muncie 4-Speed Transmissions Includes in-depth instruction and photos. Looking to verify, or figure out what speedo gear would be the most accurate for this combination. Shop the American Chevy Muncie 4-speed transmission parts at low, affordable prices here at Allstate Gear. Choose from six different GM speedometer gears, known as pencil speedometer gears, in the following configurations: Gray – 22 teeth, T5-19D, Black – 23 teeth, T5-19E, Blue – 20 teeth, T5-19, Red – 21 Use this TCI Speedometer Calculator to find your tooth count before ordering. Co. giasix, ox, my4, nsc, grz, sp7ca, egek2, 8rfn, akc, bixxl,