I read that you just have to drill out the holes for the bigger bolts. We'll see not even sure I'm going to do it yet but I will have them in the garage so i can always compare and try.
The 08+ leaf springs are longer and have less leafs so they ride nicer but they squat a lot compared to the older leafs. To compensate for that i was going to get some rear airbags to fill up when hauling and that way it rides nice but don't squat any more than she used to. I am also looking into nicer riding front leafs so that i don't have a nice ride in the rear and stiff up front. I was going to get rear 08 lift springs and front lift springs form the same company that way they ride equally.