The kits are probably for a single axle. Seeing as how you have two different axles under your truck, that is how it should be.

 

ok thank you
is this the route i should go to lift it?
or is there something else i can do for somewhere around the same price?
im tryin to do 4 inches at least?

 

4" with blocks is a bit much. You will end up with increased axle wrap when you get on the throttle which can lead to other issues.

You will not get too much cheaper and easier than a lift like this though.

When I lift my K5 more, it will be with a shackle flip in the rear and a 52" upgrade up front. But that is a bit more $$$ than a block set.

 

how about like 3 with blocks?