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I adjusted the spring on the truck even though lots of info out that it can't be done because the body is aluminum. I shot some tri flow on the threads, loosened the pinch bolt and used a fox spanner wrench to adjust the perch while it was under preload. It went super smooth! Absolutely loving...

The 21 has a lower spring rate, lower compression ratio, less leverage on the damper. If you don't set the spring lower it will raise the truck more than 2". I put these on, only wanted a 1" lift and ended setting the perch 1" from the first thread. Perfect.