Hi all,

I'm digging into the transmission of a 46 half ton. First of all, I'm interested in getting more info about the casting and serial numbers. Less info seems to be available online than for the engine. Casting number is 591195 which is from 41-46 but what does the GM2 identify? The serial number also has a DO at the beginning, does anyone know what those stand for?

Also, I'm looking for some rebuilding resources besides the shop manual. I'm more visual and am newer to this. YouTube is failing me on this specific transmission. There are plenty of videos on different transmissions, but does anyone know of any other resources for the 591195 top load 3 speed manual transmission?

Thanks!