So I decided to go a little larger lift than Carli 3.25” on my 3500 with rear air suspension. This is everything for the rear.. the only thing needed to complete is 3.25 for front end are front coil, radius arm drop, and track bar which are all available parts. I will post what I did soon.. The air tank does not have to be relocated. It does have to be removed to drill frame for radius drops. I like to keep my spare!