I have been thinking of either switching to a different lift, or adding green keys to my truck, and switching lifts is pretty much out of the question, so I have been wondering how much more height I would get with the Green keys, I am trying to run 37s, without putting Cut-Out fenders on. My 35s do not rub at all right now so I am thinking with the Green keys I will be able to clear 37s with no problem. any advice would be great.

anyone know if it would work?

You might be able to stuff them under there if you still have room to adjust. Are you running a true 6"? I.E. no torsion bar adjustment... If this is the case, you should get a couple inches with green keys (assuming you have no adjustment left on your stock torsion bar keys).

A good gauge would be to look at your cv shafts. Are they level or close to it? If so, you should be able to go up a couple inches by either cranking the stock keys, or getting green keys if the stock ones are bottomed out...if you don't mind a steeper cv angle. Might have to do a little trimming as well.