The model info is fairly correct, but I have a few more models to add. More important are some technical details regarding models using and stickshift transmission versus models using an automatic transmission that the model code does not mention.
On trucks using a manual transmission, the input shaft is the top shaft of the transmission, the center differential is in the output shaft which is the bottom shaft, and front bevel drive is right behind the flywheel in all one combined unit, and the rear bevel drive has a long torque tube that is parallel to the truck frame. The shaft connecting the two is parallel and does not have any u-joints. With this setup, the the main driveshaft rotates the opposite direction of the engine.
On models using an automatic transmission, the same bevel drive and housing that is used in the rear of the stickshift models are used in the front and in the rear. The automatic bevel drives use shorter torque tubes and different flanges connecting the bevel drive housing to the mount so that the torque tubes are somewhat angled to the truck frame, pointing up toward the transfer case. The shafts connecting the torque tubes to the transfer case have a either c-v joint or a standard u-joint at the transfer case depending on the model.
An automatic midsize B-model uses a smaller and fairly compact 2-shaft transfer case that fits right under the wing box, with the driveshafts to the front and rear also rotating the opposite direction of the engine. A modified floor pan and firewall allows the standard 72" wide cab and fenders to fit together together the same as a manual transmission model with fuel tank right between the cab and wing box.
A big automatic U-model, larger and heavier 3-shaft transfer case is used, with the front and rear driveshafts rotating the same direction as the engine. The A-style cab is used, also with a modified floor pan and firewall, but it is set back like the standard F-style cab. The huge transmission and transfer case make the cab sit a foot higher than even the largest stickshift model, and the fuel tank sits a foot off the cab mounts. The transfer case is so big, it requires a foot of space between the fuel tank and wing box to accommodate it.
The bevel drive housings are open on both sides and the side flanges are symmetrical so that the bevel drive can go in from either side depending on which transfer case or transmission is used.
Here is a link to a Walter manual (https://plus.google.com/photos/+LarryMarmet/albums/5489003114983166961)
explaining some of this. Hope this makes sense.