440 Automatic. What gears are you running?

I ran a 28x13.50r15 and now a 315/35R17 (26") with 3.91 gears. It's a blast around town, on the highway it turns the R's. 70 is about 3600 with the 26" tire, but my highway driving is usually only a few miles at a time. If I drive further, i usually only go 60-65 max to lower the rpms a little.