As part of the kit, ICON includes an industry first selectable install height for the hydraulic air bumpstop so up travel is not limited with use of an aftermarket thicker leaf pack. This allows you to upgrade your leaf springs down the road, and retain maximum up travel without having to purchase a new bump stop bracket kit. This vehicle specific tuned hydraulic bumpstop system offers both smooth engagement, maximum bottom resistance, and smooth controlled return. The compression and rebound tuned bumpstop is smooth, not abrupt or harsh like the OE bumpstop. TECH NOTE: Not compatible with 2005-2015 5-lug RWD Tacoma models