How to split shift with a 2speed axle. The classic twospeed axle dates back nearly a hundred years, used mainly on medium duty trucks, and was phased out in the late 90s in favor of 6speed and 7speed medium duty transmissions. In this video we will take a lesson in properly driving a truck equipped with a twospeed axle, while taking a drive on beautiful northeast back roads in the MediumDutyMuscleTruck powered by a CATERPILLAR 10.4L 3208 Turbo Diesel V8.