I have a 2002 RCSB that I want to drop. I only have the shackles on the back and it looks great level but I want to go lower. What's the best route to go(and brands) where I have a smooth ride.

 

Drop spindle up front for sure, quick and easy and better than springs (2WD).

Grab some rear lowering leaf spring hangers, I prefer those over drop leafs.

You'll want to grab a angle finder too, so you can measure your pinion angle before and after. Then you'll know what spacers you'll need to correct it and stop and shake.

It's going to be personal opinion on drop shocks for ride quality. I ran McG's drop shocks and they rode just fine what I used my truck for.