Best Route: Cheyenne, WY to West Yellowstone, MT

[8.1al]

I would take I80 west to I25 north to US 20 west and north to US 14 at Greybull, then west on 14 through Cody to the west entrance. To the north along 25 you will find US 16 at Buffalo and US 14, both of which have some steep grades. I would only take these if I wanted to test my exhaust brake, brakes and transmission. The campground owner in Buffalo told me they get about 30 rvs each summer needing a transmission, brakes or both after one of these highways