I haven't had a chance to use 4 low yet, save two short distances, since I took delivery last August and here it is in June almost a year later. I was on an unimproved road, very rough, in New Hampshire over the weekend and decided I would try it out to be able to traverse without bottoming out. As I was shifting through the gears looking for the right one to crawl at the right speed, the syncros didn't seem to work as well as when in 2 wd. The gears were kind of clicky clacky but without really grinding. I take it that this must be normal behavior? I'm guessing that the gearing is so low that the syncros are less effective? Anybody shed some light on this? This is my first 4wd vehicle. My son thought it was pretty cool because the terrain was pretty rockin' and rollin'. He was the one who suggested we go that way on the way home. We went that way on the way in after dark but it really looked awesome in the daylight going back through. Was on Province road in Barnstead NH.