I have my axle pushed 1" forward on zero rates and shortened my drag link 1". It works OK for me but I only have about 2-2.5" lift. My front springs are flat, straight as an arrow and the draglink is very close to parallel with my springs, and even then it is less than ideal (I'm going to go crossover one of these days). I would be leery about moving the axle forward with any more lift and stock steering. As far as the driveshaft goes, it is OK, but again I am not running that much lift.
Rich mentioned that moving your axle forward will cause interference between a high steer tie rod and crossover pitman. I have had to deal with it on a friend’s M1008. ORD sells two different crossover pitman arms, a standard arm and a "high clearance" arm. In my experience the "high clearance" arm will clear ORD's high steer system with zero rates set in the 1” hole, the standard one will not. The "high clearance" arm may give you enough clearance if you ever run into that, but even then the "high clearance" is more like "squeaks by" running your axle 1" forward. The M1008 still runs a stock driveshaft, and I'm kind of amazed that it hasn't failed. The limiting factor for droop is your shocks, and if you are willing to sacrifice droop for going with a stock driveshaft it can be done. I have also seen people run spacers on their transfer case flange for the front driveshaft, it is a little dirty, but I'm not sure you will get in any trouble with the whopping horsepower of the 6.2. Don't quote me on it but I think the part number is Superlift 4310. Again I am not positive if that part number is correct for an NP208.
