Thanks for the suggestions. I did not re-torque them - they seemed to all tight. I went for a 1500 mile round trip to Southern Oregon from Southern California and so wanted to take care of some basic maintenance:
=> Replaced all 5 stock Michelin tires (265/70R16) with Yokohama Geolander A/T-S LT265/70R-17. Gained between 1" to 1.25" of height from the taller tires.
=> Changed spark plugs to NGK Platinum plugs (Laser Platinum PLFR6A-11).
=> Cleaned the throttle-body
=> Changed engine oil (Mobil 1 Synthetic) and oil filter
=> Replaced air-filter
=> Lubed driveshafts
The truck runs nice and smooth. The only thing I noticed is that the idle engine RPM is a bit higher. Before it was at 600 RPM and now it seems to be at 700 RPM.