On my 2012 1/2 ton, 2WD Silverado.... I'd like to lower the rear without doing a flip kit.

And on the front, I'd like to lower it about 2 inches which I see Bell tech has 2 inch dropped spindles for the front I could use
(I want to keep the stock springs and struts to retain the nice factory ride

So what's the best method of lowering the rear without using a flip kit and without altering the pinion angle?