It will kick and buck like a mother fudger on dry ground. That is normal. You could always take my moms expedition out on the highway in dry weather and experience what it is like to have it kick into 4X4 at high speed for no apparent reason. It has done that a few times along with kicking in at low speeds going around turns once in a while. Ford has replaced the GEM module twice already and it now needs a 3rd. They keep sealing it up and after a while it will get the module wet again and start acting crazy. Im not saying I wouldn't rather gm trucks be built here but I love and trust the LS platform and I like the interior of the gm suv's. I am about to turn 23K on my mexican avalanche and I haven't found anything wrong with it.