440 Automatic. What gears are you running?

So, if I read this correctly, you like the 3.73 better with the shorter tire than the 28" tire. Since I'm staying with the same 28" tire size as you referenced would you recommend going with the 3.91? I'm assuming you already tried the 3.73 with a shorter tire and liked it better than the 3.73 with the 275/60-R15. Yes?
The shorter tire with a 3.73 is a tire burner for sure but with the 275s it can cruise better.