Found a web site explaining how the calculate speedometer gear for Muncie transmissions. Hope this helps
https://www.cartechbooks.com/blogs/techtips/muncie-speedometer?srsltid=AfmBOoqcrGKcZTpjJ84u9vhnhNlz8WOeFN649qxkHpYIJMXVILNTTLBu
https://www.cartechbooks.com/blogs/techtips/muncie-speedometer?srsltid=AfmBOoqcrGKcZTpjJ84u9vhnhNlz8WOeFN649qxkHpYIJMXVILNTTLBu
