07 supercrew already lowered 2" in the rear with shackles.

I would like to lower it 2" in the front and 2 more inches in the rear.

What parts do I need and where is the cheapest place to purchase what I need?

And will it look good lowered 2/4 with 275/45 20's on it or do i need to get a lower profile tire?

 

What lowering shackles did you use? Eibach and Ground Force makes good lowering kits.

 

You could do 2" hangers in the rear, 2" drop coils up front, and might as well get some drop shocks while ur at it. I'd start looking on eBay if ur talkin prices.