I had an '08 GMC Sierra 5.3L 3.73's that I put 145k on the clock. That truck went through three tough winters, and was basically left in Auto 4x4 each winter. Never had any problems at all with the system. Worked great! Now, I have an '11 GMC Sierra 6.2L with MAX trailering package and 3.73's. So far this winter, we really haven't had much winter yet, so this truck hasn't been used very much in Auto 4x4, but so far it is working flawlessly, just like the other truck. Do love the extra power of the 6.2L!! While I don't concern myself overly much about fuel economy, the difference between the 5.3L and the 6.2L isn't very much, I figure I am losing about 1 mpg gallon driving the 6.2L. Well worth it to me for the extra horses!
Last edited by mudstud; 01/07/12.
