Had a transmission shop check out my setup today - in their opinion, it's driving pretty good. They did notice that it was shifting gears early, but that at 40+ MPH, it was shifting like it should. They said the loud noise at speeds 70+ MPH was a misaligned drive shaft. They really liked the truck but hated my accelerator pedal position. Me too.

Here is the weird thing, and I have never heard this before, so chime in if you know anything about this - according to this shop, they said that it would be 100 to 120 miles before the transmission really develops a regular shifting pattern. I've only put about 50 miles on it since I got the truck up and running. Is this correct: do these newer transmissions on a GenIV have adaptive smarts?