The Firestone 4100 Coil-Rite Front Air Helper Spring Kit fits inside your vehicle’s factory coil springs and adds air springs for adjustable support. Designed for front coil-spring suspensions on specific Chevrolet/GMC models such as P-30 vans, full-size Blazer/Suburban/Jimmy pickups (2WD) from the early ’70s through late ’80s, this kit helps level your vehicle under load while improving braking and handling performance without modifying the factory suspension geometry.
This kit includes two air helper springs, pre-assembled supports, all necessary hardware, push-to-connect inflation fittings and separate manual inflation valves. The air springs are made from durable elastic polyurethane and are designed to tolerate extreme temperatures from -40 °F up to 180 °F, ensuring reliable flex and strength without cracking or softness under thermal stress.
With the Firestone 4100 Coil-Rite kit, you’ll enjoy a smoother ride over uneven roads, less sag when hauling cargo or towing, and improved vehicle stability. Adjusting spring performance is as simple as inflating or deflating the air springs. Installation takes about 1–2 hours, and no drilling is required, so you can retain factory restart and leaf springs. This kit helps protect tires, maintain headlight aim, and improve overall ride quality for both daily driving and heavy load conditions.