Just purchased a 1999 4x4 Frontier and was trying out the 4x4 and noticed something odd. When in 4wd if feels almost like the brake is on and the truck is almost "fighting" itself to go forward. If left in idle it will not move unless throttle is applied and when left to drift will bring itself to a complete stop, almost like the parking brake is on. There are 2 different tire sizes from from front to back. 265r70's on the rear and 225r75's on the front. Was wondering if the different aspect ratio of the tires might be the culprit as they are trying to turn at different speeds. Local tire shop says no, but I have my doubts.