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I copied the second pic to my photosuite and after adjusting the contrast and a couple other items, then blowing it up it sure looks like a 3 inch spacer in there to me.
The dual shocks are nice touch. Thier brand may clue you in to the lift maker.
With only 5 leafs in that leaf spring, looks like either stacked blocks or a really tall block. 5 leafs was pretty standard on some 1/2 tons and 3/4 tons. I hate to ask for more, but any pics you can get of that block(s) in the middle underneath the leafs? From underneath maybe, so the tire isn't in the way? Not 100% necessary, but would let us give you a better idea of what you have back there.
Those blue coils, unless he painted/coated the factory units, are not original. The originals are black.
Those shocks in the coils, Rancho RS9000, are great shocks... adjustable ones, IIRC, so you can control how firm the ride is.
the coils were painted. can get better pics n the morning. I'll take them from under. yeah I heard the shocks were worth almost as much as I paid for the truck