AT4/AT4X/Trail Boss/ZR2 are popular with the interior upgrades, paint matched bumpers and door handles (or the upgraded black bumpers AT4X/ZR2), and black trim instead of chrome. They also have an increased ride height over the other models, essentially a leveling kit with also a lift block added in the rear. The AT4 and Trail Boss still have cheap shocks and a hefty nose down rake. The AT4X and ZR2 have upgraded shocks (Multimatic DSSV) which are better but still leaving a lot of performance and ride quality on the table.. Adding this Cognito leveling kit will maximize the suspension travel opportunity by adding 1 more inch of front droop travel and then converting that into 1 more inch of front ride height. Maintaining a minimum of 3" of droop travel is crucial for optimum ride quality, and adding the 2.5" Fox Performance Elite Series Reservoir shocks is another major upgrade in dampening control.. Cognito 1-Inch Elite Ball Joint Leveling Kit with Fox 2.5 Elite Performance Series Shocks for 2019-2025 Chevy Trail Boss/ZR2 & GMC AT4/AT4X 1500 2WD/4WD. Note: Does not fit models that are not the AT4/AT4X/Trail Boss/ZR2, unless a rear lift block and bump stop spacer is added.. Cognito 19-25 Chevy/GMC Silv/Sierra 1500 1in Elite Leveling Kit w/ Fox 2.5 Elite Perf Shocks. 1"Leveling Kit with Fox 2.5 Shocks for 2019-2025 Trail Boss/ZR2/AT4/AT4X 1500. Enhances the Trucks Appearance and Reduces the Factory Nose Down Rake. Maintains Adequate Droop Travel for Superior Ride Quality. Fox 2.5 Performance Elite Series Remote Reservoir Shocks. Cognito SM Series Upper Control Arm Kit. Yields 1 Inch of Front Lift. Improved Ball Joint Angle. 4-hour DIY Install Time. 1" Leveling Kit. Made in the USA. 210-P1298

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