While cleaning up the 3 spd. transmission from my '30 AD 1/2T PU, I discovered a serial number stamped on the top of the casting. The number is BG62307. The casting number is 590391 and the cast date is E 13 0. The truck body ID is 5AD 36----. I wonder if the serial number is significant or just a number that was used to keep track of "units used". Just curious.

Art