What kind of springs are these?

[pritch]

That's wierd, the 3/4 ton thing. I can't speak for the first 11 years of it's life, but I bought that truck in '78 and I know I've never changed out the 1/2 ton for 3/4. Today was the first time I ever changed the shocks! I was surprised that I didn't have to get out the torch to get the old one's off. The springs seem much softer than I would have guessed, for a 3/4 ton.