I need drop shocks for the rear of my truck. Its lowered 2/4 and rides like crap. A friend told me belltech street and performance were good. I looked at several websites and there are 4 different part numbers. Which one do I need? Its a 2000 Chevy RCSB with a 2/4 drop. Are the belltechs the softest drop shocks? And finally do I need shock relocators?