I have a 2006 silverado 2 wd I have a 4/6 drop with djm control arms in front and flip kit in the back and C noch. I want a 6/8 drop I will install 2" drop shakels in the back my questions is what's the best way to get a 6" drop in the front with not having alignment problems. Should I get 2" drop springs or 2" drop spindles?

 

You're going to need something to adjust the camber up front. There are camber bushings that replace the ones in the upper control arm that allow for more adjustment.

 

Prepare for a lumber wagon ride.

 

werd.

It's going to ride rather rough.

 

I'm planning on installing belltech street performance shocks in front and back with shocks extenders in the back

 

I'd get rid of the control arms and get spindles, coils and maybe struts to get you that low.
Like madman said, alignment bushing are going to be needed to accomplish this to you in spec.