I am not sure what springs are in there, maybe Dan can chime in if he knows, but they appeared to be stock and I think had one add-a-leaf when I first got it over a year ago. Before I started wheeling it I put in one more add-a-leaf in the rear. Over a long wheeling season, it seemed to drop quite a bit and the front was almost flat.
So this winter I put in a few extra leafs in the back and I just got my fronts back with 3 extra leafs added. (I wanted one long and 2 short, but they put in 3 long ones) I pulled the old add-a-leaf because it looked way too big and arched, so I will install it like this and see how it is. Was going to put 1in longer shackle in the front but think I will go with stock for now untill it sags down again otherwise it might be too big up front ( got 2in longer shackles in the back). Hopefully won't be too stiff, but right now I have 9 leafs up front and 10 out back. will see how things go.
Cheers,
Deny