I had BDS 2" lift put on by my local dealer @ 1 and 1/2 months ago. It gave me 3.5" of lift, and has not settled at all yet. I get a little driveline vibration. We did T-case drop, but not degree shims, as it said was not necessary on 2" lift. They said to bring it in in 350-500 miles to check tightness of everything. My steering wheel was off center, but still drove straight, they said the lift instructions said it might need to be re-aligned after the install, we did that, and wheel is back to center now. I'll be bringing it back in to check everything in about a week, so far everything seems ok. I have a 4 banger, and I put on 31x10.5" tires, my mileage (city) went from about 20 mpg, to 18 mpg.
'95 YJ, "Toy Story", some mods done, some mods on the way.