I was digging everywhere hi and low for a certain driven gear for an early Muncie. I stumbled upon this place. They have gears and drive parts for almost anything and have ratio adapters to increase and decrease depending on what you need. Also a fair amount of tech info as well as transducers for the newer electronic based transmissions.
http://www.transmissioncenter.net/speedometer_calibration_______va.htm I bought an adapter and service was quick.
