Best I've found is:
IDENTIFICATION - common light duty Muncie 318 Cast iron case and extension housing with 4-bolt side cover. Has non-synchro 1st and a "barrel" type 2/3 assembly. Units from 1940-54 have enclosed driveline. Those from 1955-68 may have electric overdrive (designated as 319). May have short or longer extension housing. Some of 1964-65 units have larger gears with the same tooth count as the 1940-68 units. 1st gear ratio Suffix A equals 3.03:1, Suffix B equals 2.42:1.
Synchro replacement parts not available at this time.
