So with the jmr and 285/75/r16, would it be best to go ahead and do a 4.56 or just the 4.10? Pros and cons? Also, so is the ring and pinion set all I would need? I would need two since I have a 4x4 correct?

 

Really, a personal preference. With 285/75/16 (33's) you could get away with 4.10's. They will be much better then stock 3.55, but you will still not have the get up and go, that you had with stock tire size and 3.55's. You're going to spend the same amount, for 4.10 or 4.56 gears.

And yes, unless you wanted a full rebuild kit, the ring and pinion set is all you would need. Two sets for a 4x4 is correct.