Except for the grill, rear fenders and Rear diff, it looks like my 1939 3/4 ton. The 1/2 ton would have the axle over the springs. The 3/4 will have the axle under the springs. The 3/4 ton would have had an additional short closed drive shaft in front to make up the additional 10" or so of bed length. (kind of like the GMC long bed). Don't want to violate any posting regs, but if you are trying to return this vehicle to original, I know where you can get a 1940 3/4 ton differential free. Send me a private message.
Looks like I've located a pair of '41 rear fenders near me. As I understand it they are the same as the '40. I've also located a 6 lug, 12 bolt rear end with a 3.73 ratio. Anyone know what the WMS to WMS was on the '40? The Oldcarmanualproject manual is missing those pages. The one I've found has 62".
Not sure why anyone would shorten a short bed but I guess, as they say, to each his (or her) own. Any thoughts on the 12 bolt, 3.73, 6 lug rear end for this truck? I've also found an online place that has Artillery wheels but I'm thinking they may have to wait until I get the basics done first. I can throw a pair of steel wheels on there for now.
I've always measured complete rear ends from Wheel Mounting Surface to Wheel Mounting Surface. On my '46 stake bed it didn't really matter too much since there were no fenders to deal with. I think I'll probably have to wait until the truck gets here and I can measure the space between the fenders to make sure. Looks like there are several 6 lug units out there so it shouldn't be too much of a problem.