The transmission that came with my December 1939 built, 1940 KC 1/2 ton pickup has cast on its left side: 591195 GM2 41 H280 The serial number from what I understand is stamped on the top of the case and it reads: 6II836I with what looks like a 'Y' on its side to the left. (See Photo)
The project is new to me and I am trying to ensure that I know what I have. I am also trying to understand how to use the Master Parts Catalog and where to ask various questions on this website.
My impression, from what I have found in the Master Parts Catalog and by searching the internet is that it is a rather common 3 speed. (Am I correct?)
Does the 41 on the left side of the case indicate the year it was built? What does the H280 indicate?
What can be learned from the serial number? (I was surprised to see what look like upper case letter 'I's in the serial number as they are easily confused with 1s.)
The 591195 is the case casting number and the case part number is 591194. i believe the H280 is the date code for Aug.28 of 1940. My parts book list the transmission being for 41-47 Commercial. (3-speed) .
