The rear half of a complete air ride system for the C3500, this Phat Phabz kit replaces your factory rear leaf springs with air bags and correct mounting hardware, giving you fully adjustable rear ride height instead of a fixed static drop. Built specifically for the C3500's heavier leaf spring pack and payload rating, this kit is engineered to handle real work-truck loads while still delivering a full slam-to-the-frame stance when you want it.
Paired with our matching front air kit, this gives you complete control over your C3500's ride height - air out for a dramatic show stance or cruise night, air back up to full ride height for towing or hauling, all without the compromises of a fixed static drop. This flexibility is the main advantage air suspension holds over any static kit, especially on a truck like the C3500 that's often still doing real work duty.
Installation involves removing the factory leaf spring pack and installing the air bag brackets and mounting hardware at the axle and frame, in addition to running air lines to your compressor and tank setup (typically shared with the front system). This is a comprehensive suspension and air management install, not a simple bolt-in, and benefits significantly from experience with air ride systems or professional installation.
Given the load a C3500 rear end carries, proper air bag sizing and pressure management matters more here than on a lighter truck - running the correct PSI for your load at all times is essential both for ride quality and for protecting the air bags themselves from over- or under-inflation damage.
We recommend a qualified air suspension installer handle the plumbing, wiring, and calibration if this is your first air ride build, and thoroughly test all functions before returning to regular driving.
