Why do you want to disconect it. It only functions at a cruise rpm if working correctly, and it increases mpg (alright not much)and decreases combustion temp. <img src="/forums/images/graemlins/confused.gif" alt="" />

America's first fourwheel drive was built in Mankato, MN by Ernest Rosenburger in 1908 who founded Four-Traction Auto Co. on Hickory Street. The company though successful closed in 1913.