We have driven to/through Yellowstone many times. In my opinion, and the route we nearly always drive now, is to continue on I 80 to Rawlins, then US 287 N to the South Yellowstone entrance. That misses most of the mountain grades, and you get to stop at Jackson/ Grand Tetons first. When we leave and head East, that highway is all downhill to Cody, WY.
If you don't mind mountain driving from Cody > West, the route to Thermopolis and the hot springs, I25 to Casper > US 20 to Thermopolis > WY120 takes you to Cody. Then it's all uphill until you reach the lake in Yellowstone.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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