4-Inch Spacer Air Spring Kit with Compressor for Silverado 3500 HD

4-Inch Spacer Air Spring Kit with Compressor, fitment-checked

This one is built for lifted heavy-duty trucks. 100074WC includes the rear air spring kit rated for 0–7.5 in of lift, a 4-inch 4-degree spacer set to position the bags at that height, and a wireless air bag controller kit with compressor. Fitment spans 2011–2019 Silverado and Sierra 2500 HD and 3500 HD in 4WD and RWD, plus the 2015 Silverado 3500. Minor drilling is required.

The spacer is what makes this bundle work on a lifted truck: it takes up the extra distance between frame and axle so the bag operates in its designed range instead of stretched out. Pressure is managed from the wireless remote through the onboard compressor. Trims covered include High Country, LT, LTZ, and WT on the Chevrolet side and Base, Denali, SLE, SLT, and WT on the GMC side. A downloadable installation guide is available. Drilling is part of the install, and air springs do not change the rated tow capacity.