[lolife99]

No rear shock relocators are needed if you stay at 4" rear drop or less.
(My opinion) The relocators change the angle of the rear shocks on a 5"-6' rear drop.
You need this.
Otherwise they just pivot on the shock bolts because they are laying too flat.
You can probably do without the adjustable track bar at a 4" rear drop, but you always need to measure and see if the rearend is centered under the truck.
I would always use one.
That's really the only 2 things I would associate with your "other stuff" comment.
You need the rest.
Good quality springs, shocks and drop spindles.

You also need a front sway bar with good bushings if you don't have one.
Best bang for the buck on these trucks.

It's funny, most people that install a set of 3/5 or 3/4 springs always want to go lower.

Here's a picture to help motivate you,...