440 Automatic. What gears are you running?

I ran a 26" tire with 3.55 gears and it was okay - a little wound up at highway speeds but not too bad. Now I have 28" Nittos with 3.91's. Pretty noticeable difference and I like it but don't know if I'd want to spend a lot of time at highway speeds. 3.73 might be a good compromise for you but it's all very subjective.