If you don't encounter any traffic, the Pavement to the Springs Campground can be done in a little over 2 hours aired down without using a locker and without using 4WD. TURBO and I did this for MCR9 in the dark in 2WD and it took us two in a half hours. There were just three spots coming down Cadillac hill where you'll have to use your brakes to keep the front end from freewheeling.

BigMike