What gears with OD A-833?

For highway driving I didn't like my 4.10's even w/ the o/d. My tire was a bit shorter than yours though @ 205-60-15. It really got to droning and was uncomfortable at 65 mph for any length of time.

Now I have 2.90's (w,225-60's) and I believe I've gone too far in the other direction. First gear isn't bad but it falls on its face in second.

I need to work out what 65-70 mph cruise rpm will be with 3.23, 3.55 and 3.73 respectively, and make a choice. Like you I don't want highway cruise to suffer too much.