[Richard]

Hard to say what gear because you have a lot more to choose from than most of us. But, you will know what gear when you get there. That’s not a smarty pants answer, but rather means as you start down the grade and let off the fuel, the jakes will activate. If you find that you start to pick up speed and approach your comfort limit, then downshift one gear. Rinse and repeat, with continued downshifting until you get the speed you desire.

The lowest I ever downshifted into was 2nd gear. That was descending into Ouray on Hwy 550. I was going about 10 mph.