How would that defeat the purpose of 4WD? A lowered truck could use as much help getting through ice and snow as a stock or raised one. Not everyone takes them off road.
The only kit I know of is the 1.6in drop spring kit from EE for the Gen 3 Explorer, but I remember as Tiger said that Wayne was talking about dropping Gen 2 STs. You might want to shoot him an email.
Mookie, even though the half shafts go through the frame, there is a little room for play. You can drop them, just not much without serious modification to the frame. The only reason the Adrenalin concept looked so low was because of the body kit it had. It really wasn't much lower than the stock production ST.