Hi - I have stock 2006 F250 SC 4WD and want to order some Rancho shocks and need to know if it has stock, 2.5, or 4" lift. Anyone know what it comes with . Under the rear springs are 2 rubber blocks - one on top of the other - that are 2" tall each. So is that a 4" lift or is the one block a normal component and the other block is a 2" lift or is this considered stock and really no lift. I don't want to order the wrong shocks. thanks