Technically, what you have is a bastard pack. Add a leaves are one thick leaf with a lot of arch purchased new. Bastard packs can go either way for ride stiffness depending on what the donor spring is.

 

x2 mine rides like poop

 

The long leaf I added had Rough Country in white lettering on it, the smaller leaf was extemely thick but was too worn to see if it was also a RC spring. I had to use a 8" C-Clamp to get around all the springs, mine was basically flat the springs with my lift had 5 times the arch my factory's did. I was actually suprised none was broke, I've hauled a lot with this thing, from 6-8square of shingles in the rear (Rubbed like hell, lol) to a F/S Chevy Z71 on a 32ft Dual Axle trailer through the mountains of SW VA