Like Chickadee, I only did the Rt. 160 portion of that route. Wolf Creek Pass was big, but did not seem as hairy as the previous days ride on Rt. 550 from Ouray to Durango.
Looking at my geeky mapping software, I see you will go over two passes from Gunnison to South Fork. Here's what Wikipedia says:
Slumgullion Pass (el. 11,530 ft.) is a mountain pass in Colorado traversed by State Highway 149. The north side has the steepest grade of any continuously paved road in Colorado (9%), but the pass does not close often in winter, since snowplows clear the route regularly during this season. It has a few switchbacks and tight spots, but other than that, most travelers will find it an easy, scenic route.
Spring Creek Pass (el. 10,901 ft.) is a high mountain pass in Colorado traversed by State Highway 149.
Take it slow and cool your brakes. It should be an 'experience'. Good luck!
Tom and Katharine
'07 Winnebago Tour 40TD, 400hp Cummins
RVing for 19 years & 150,000+ miles