I'm not a pro on this, but appears to be a leveling kit. There are spacers from front to back as if the body was lifted from frame. Wheels are 17''. So I guess I made a good call. Plan to add extras also. What are the stock gears on 2007 and where would it say. Is it on drive axel?
Sounds like a body lift. A leveling kit uses spacers on the front springs to lift just an inch or two or at most three. Sometimes leveling kits also give a small lift in the back. If there are spacers between the body and frame that is a body lift kit. They are good for looks, but the bad thing is you don't gain any ground clearance (as you would with a suspension lift). But if all you care about is looks they are fine. Sounds like you got a good deal...
I suggest you request your trucks build sheet here(VIN required):
It will have your rear gear ratio on it.