I think the term "freeway speed" may mean different things to different people.
I also live in Atlanta and drive my truck several times a week on the interstate. My stock 216 with 3spd cruises comfortably on the interstate at 60mph. Of course, that's right lane only territory. It's fast enough not to be dangerous to me or others but I'm under no illusions that I'll be cruising at 70.
The truck performs just fine at 60 mph and I have no desire to make any modifications to drive any faster than that.
About the best thing you can do for your truck to increase "high speed" driving is to install the largest diameter wheels and tires that will fit like 225/85 R16.
