The JKS 3.5″ Coil Box Kit is a set of front and rear dual rate coil springs that are typically found in the JKS JSPEC 3.

Specifically tuned to provide superior on-road comfort and off-road performance, Rancho® corner-specific progressive rate front coil springs ensure that your 4-door Jeep® Wrangler JL Diesel maintains a level stance and ride – even while under heavy load or towing. These Rancho front coil springs provide up to 2-in.

Our engineers focused on extensive rate tuning and dynamic balance between front and rear and side-to-side load bias to produce Lift Coil Springs that deliver unsurpassed highway handling and off-road performance.
TeraFlex chose the same tried and true linear rate technology preferred by most automakers including Jeep.

TeraFlex Rear Coil Springs Features:
Shot peened to reduce spring sag and fatigue as well as increase life
Powder coated for superior element protection
Sold as pair
 
Equip your Jeep for Off-Road Travel
Engineered 5-inch lifted spring for Jeep Wrangler TJ/LJ. They have extensive rate tuning and a dynamic balance between the front and the rear load that is bias to produce coil springs that offer great highway and off-road performance.