honestly looks like a whole different truck.
Thats the first thing i said to myself when i clicked on the pictures LOL
Looks great Bro! Speedo May be dead on now ? you will have to check it with a GPS or one of those Road way Speed checkers LOL
Most trucks I find are one MPH slow from the factory...
You also could get the Wife to drive the other car at a steady 55 or 45 depending on the road,while you follow her to get an ideal of where the Speedo's at LOL Thats the Red Neck Way :~)
Also you went from a 7.5 wide wheel to a 8.0 wide wheel
so now if you want you can level the truck and run a 35/12.50/20 tire