My explorer had a 4" lift of that style on it when i got it. I don't know where it came from or what manufacturer it was. something i will mention about it though, it needed a little "trimming" on the drivers side drop bracket (or else the diff would collide with it at full compression).
i have since removed the stock axles and suspension and put in 1 tons.
if your short on cash, look in junkyards for lift stuff. i lifted my bronco with a drop bracket lift kit i found in the junkyard, and it worked great. lots of air time, went down the rubicon, 4x'd good and everything.
here's a kit on summit (i just did a quick search, there are tons of them) it includes quite a bit of stuff you don't need (sway bar junk, new shocks, etc) but it gives you an idea of what you need..
http://www.summitracing.com/parts/SLF-K491/?rtype=10
depending how resourceful you are, and if you have use of a welder (or friends who can weld) this will help you greatly..
front end stuff you would need is: lift springs, drop pitman arm, axle pivot drop brackets, radius arm drop brackets (or extended arms). your stock brake lines and shocks can be reused, the shocks may limit down-travel a little but not a big deal. junk your sway bar stuff (first mod for offroad vehicles, sway bar removal)
if you can weld (or get a friend to), you could build your own extended radius arms pretty easily.
for the rear, if you want about 5.5" of lift you can do a spring over axle swap (there are write ups on here how to do that im sure) or else you can do add a leafs, or add junkyard leafs to the pack, or get rear lift springs. or make a longer rear shackle and put a block between the front shackle and the frame.
how crazy do you want to get?
mike. your explorer looks pretty nice there.. how is wheel to fender clearance with the 35's?