I just picked up a '65 320.
I see in the manual there are three different cargo weight capacities, U, UN, and UP. How do you tell which one it is? In the manual I see there were different trans and axle ratios, and different springs and wheels.....is this the only way to tell or is it labeled somewhere?
My truck seems to be a UP, based on the spring configuration and the very old 600-14 tires, I haven't checked axle ratio yet. Springs and obviously tires can be changed though. I can't even imagine putting 2000lb in my truck though.