You will be looking for, 46 - 49 ALL 1/2 TON COMM ( 16 teeth ) #3652344
My parts book is the 1929 - 1949 so gears may be available in later assemblies as well. The gears are in section 5.528 of the parts manuals.
Thank you Joe we are at Frog follies in Evansville and looking. Do you know I'd 3/4 and ton are the same?