The Fabtech 6-inch lift kit component box for 2020–2021 GM 3500HD 4WD includes Dirt Logic 2.25 monotube shocks tuned for lifted OE-position and multi-shock setups. The Dirt Logic 2.25 is described as delivering a supple highway ride with strong off-road damping, and the component box organizes the matched suspension pieces needed for this 6" lift application.

Fabtech 20-21 GM 3500HD 4WD 6in Rts Sys w/Dlss Shks