FYI, the stock '50 and newer trucks have a spring rate that is half of what the '37s had, and the trucks are heavier, that's just shows how over sprung the early trucks were.
Joe
Not that I didn't believe you Joe, but I needed to look it up, and there's definitely a significant difference. Here are the numbers for 1/2 ton trucks.
1937 spring rates: Front - 475 lb/in, Rear - 200 lb/in
1950 spring rates: Front - 315 lb/in, Rear - 190 lb/in
For the front springs that's a significant difference. When my '51 chassis was assembled, I could barely move the front springs by jumping on the frame, and I'm 250 lb. The rears, I could move a bit just by pushing down on the frame standing on the ground. A '37 would definitely be like a rock in the front.