As eluded to by gait, there can be issues with the front driveshaft.
The double cardan joint helps, but if you increase the angle on the front uni joint too much you can get some weird noises and vibration. Ideally, the angle between the yoke and the driveshaft is close to zero degrees, but that is normally not obtainable.
You can rotate the axle slightly to resolve this problem, but that will also change your castor, so it's a bit of a judgement game. Another option is to use a second double cardan at the front, if you go for a bigger lift.
Another thing to be mindful of is the amount of travel you have in the front suspension, as this will determine how much travel you will get in the driveshaft's telescopic joint. Too much travel and it could come out, or worse.. if it bottoms out you can damage the transfer case.
