By looking at the front axle cap, it is not a 2 ton but a 1 ½ ton 4100 PJ or 4400 PK depending on the wheelbase. If the serial plate is missing check the rear axle prefix, that will tell you the year and tonnage of the truck. The same transmission prefix was used in the 1 ½ and 2 ton trucks. That will just give you the year. Check the engine prefix.
