Re: lookin for 6\" lift
A used kit is one thing, but if you buy an el Cheapo kit, you will not be happy with the ride or the flex, and they may not last long. Good kits use good steel, so you will be money ahead to buy a quality lift.
I highly recommend the Skyjacker leafs.
Also, you're better off to get a quality kit with rear blocks than to buy a cheapy system with rear springs. Think about it, if their springs are made out of Mexican steel and ride like crap, do you really want TWO MORE of them on your rig?
That's my story...
Poundin' the ol "pavment"!