No lift (as far as I can tell) and I like the look and ground clearance of the 31s. I do have to drive interstates quite a bit, and I have read that the bigger tires can really sap the power on hills. A lot of guys seem to think a re-gear is necessary, but I have no idea how expensive that is or how hard the swap might be. After years of blowing money and time on hot rods, I have vowed that everything on the wrangler will be done easily and cheaply, or not done at all. In other words, if i can't do the swap in my garage with mostly hand tools, it aint gettin' done.
I have also read some stuff saying that they didn't have to re-gear, just down shift tho 4th uphill on highways. I could live with that.