rear gearing with a four speed A833.

Hey, Rusty
As you may know, I love math.I plugged your pick-up numbers into the formula and with a typical P225/75-15s(89"roll-out), and 3.73s; 60mph comes to 2655rpm. Sounds like a reasonable place to be.
I also find myself cruising at sub-60mph, now, as I get older.Whats the hurry, I say.But if I get too slow, I get sleepy. On long trips, and as may be permissible,I like to boot it up to where Im wide awake, somewhere north of 75. At 85 on the Interstates, I can stay awake for hours and hours. At 50, sometimes 10 minutes and Im done.