[Altec]

Honestly, the easiest way to get 4" of lift is doing a 52" conversion in the front using stock rear leaf springs from a 1/2-ton 73-87, and doing a shackle flip in the rear.

Just remember 52" leaf springs in the front are very flexy, so if you ride on the street I suggest slow cornering, or a sway bar.

Pirate 4x4 has a lot of info on both conversions. Some junk yard rear springs for the front, some steel plate/channel, and a mig welder is all you need access to, to do this.