I did not have a rear swaybar. I decided not to put one on this time just to see how it was. Truck was dialed without it, but the front tires were glued up the sidewalls. On my 6.2 i ran a rear sway bar but did not have glued sidewalls.

I have 2mm 1.6 2 hole in front and 2mm 1.8 2 hole in the rear.
40wt oil front and 35 rear.