What size tires do you plan to run? I'm running that exact lift but I returned the 5.5" springs before installing them & swapped 'em for the 4.5" springs when I learned just how tall their 5.5" lift is. I'm running 35" tires & with that much lift, I could actually run 37" if I wanted to with no rubbing. Their 5.5" is more like 6.5" in reality. I much prefer the slightly lower 4.5", my COG is important to me on the trails I run & need to keep it as low as possible.
You'll definitely need a SYE kit and CV driveshaft & you can't really wait to install those with such a tall lift, the 4.5" definitely needs a SYE/CV driveshaft too.
__________________ When you have a choice, buy American.