[ QUOTE ]
all 3/4 ton trucks have a 56" leaf, which is the same as the 1/2 ton sub leaf, and they are 6 leafs. so you can go to the Wyard and pick some up for cheap!
[/ QUOTE ]you'd be surprised...
my 77 C20 pickup had 56 inch springs, and my 77 C20 suburban had 56 inch springs... my 73 K20 has 52 inch springs, and my 73 C10 suburban has 56 inch springs. not only that, the pickup had 7 leaf pack springs, the 77 c20 sub had 9 leaf pack springs, the 73 K20 has 7 leaf pack springs, and the 73 C10 has 10 leafpack springs. since the 77 C20 sub has sagged to hell, and broken rear springs, I'm planning on putting the springs from the 73 C10 under it, to level it back out, and get the a$$ off the ground ( boy it pisses me off to drag trailerhitch leaving parking lots)
the point is, they kinda put springs of whatever type under whatever vehicle they felt like puting them under, depending on what hte vehicle was to be used for. all 3 of the suburbans are factory original trailering specials, its just that the pair of 2wd's have 454's and higher GCW ratings then the K20.
final note, I tried to get new replacement springs for mine, and found out they wanted 300/each for the factory 9 leaf heavy duty springs. I think I might just get a pair of 2 inch lift springs instead for the back, and figgure out how to make the front level later.
-Rich