I replaced a demolished xfer case and u joints and odd bits in our 88 XJ. When I got her all together, fired it up and carefully drove up the street it seemed to be sluggish, as though it's in 4wd. Messing around, I discovered that when the 4wd shifter is in 4H I believe I'm in 2wd! I'm not sure how this might have happened other than I might have moved the linkage; is this just a linkage adjustment?