I have a 2003 1500 4x4, 115k. With O/D on, at 50-55+ mph, the entire truck shudders, bucks and on one occasion reduced power, the RPM's would not get above 2k, and would not exceed 55mph. I replaced the rear brakes and emergency brakes, U-Joints, rotated and balanced tires. With O/D off, there...