[69gmcc10]

So, you want your truck 5 inches lower in the rear, to handle and you are going to run big wheels and tires. First let me begin with saying there are allot of different opinions on how to do this and this is just mine, maybe someone else will chime in with another point of view.

I would start with 2" lowering blocks, they lower all the handling variables with minimal changes to changes to the trucks geometry. Blocks also make it easy fine tune your ride height for the rake you are looking for by simply removing the 2" block with a.5", 1" or 1.5" block. Next I would go with a 3" lowering spring, shocks and shock re-locators (modify what you have or buy the kit) to help keep the effective angle of your shocks correct to match the lowering springs. The final thing I would recommend would be an adjustable long panhard bar to center the rear axle under the truck and help keep it there through the suspension cycle. Optional, I would flip the trailing arm mounting bracket on the cross member to adjust the anti-squat of the truck for better traction and help correct most of the pinion angle change caused by the spring swap. Up front go with a drop spindle, a lowering spring (or cut the spring you already have) and a 1 ton sway bar.