TwistedPhil
+1y
The rear will be easy- 2" shackles, 2" hangers, or a 6" flip kit and 2" lift shackles. The rear is the pain, because the suspension is totally different from a 2wd. I think I can actually get lowered torsion keys from Taiwan, but I never have, because nobody ever wanted them. They're around $40 for the pair, i think, and they lower the front around 2". It'll take me a month to get them, so let me know if you're interested!
But seriously, just tell him to either lift it or get a 2wd truck!! Even with the keys, the front suspension will be out of whack!
-Phil at FBI