Huge thanks to the guys above, took their advice and loving it - spot on! My notes below from 6-16 trip
Yellowstone - from Tower Lodge through NE section of the park out the NE gate - best nature / rugged scenery in Yellowstone, zero crowds. (South end is all Disneyland ugh.) Also out the North gate, town of Gardner, across from Conoco station is Jardine rd - leads to many forest service roads - some too tough for my Jeep Grand Cherokee, others nicer, go up for mile after mile. Did Ash mountain, can see Mammoth hot springs its up so high. Zero people up there, gorgeous. I am sure other roads near there are awesome too.
Highway 212 from NE Gate of Yellowstone to Red Lodge Montana - jaw dropping natural beauty. Huge, epic, amazing drive ! DO NOT MISS THIS. Many great looking Forest service roads. Lu Lu pass and others are clearly marked in Cooke City right outside NE gate.
On the Red Lodge side great gravel roads 7 and 8 mile runs - Glacier lake etc. Doing those tomorrow. Town of Red Lodge is historic, good food, bars, hotels, close to 4x4 roads. Crazy pretty - will base here next time.
IMHO Tetons and Yellowstone are touristy and now where near the Bear Tooth side in terms of 4x4 roads and awesome views and solitude.