Rock Jock Coil Spring

Rock Jock Coil Springs: Competition-Proven Lift for Serious Off-Roaders

When it comes to off-road suspension engineering, few names carry the weight of Rock Jock 4x4. Founded by John Currie — whose Jeep roots trace back to the 1980s — RockJock's origins come from John pushing his vehicles to their limits on the trail and recognizing the shortcomings of available equipment, with the goal of designing and building the best-performing, strongest, and most durable products on the market. That philosophy is baked into every coil spring the brand produces.

Purpose-Built Dual-Rate Coil Springs

What sets Rock Jock apart in the coil spring category is their commitment to dual-rate spring technology. Their dual-rate springs feature a soft initial rate that absorbs small bumps and trail chop to deliver a smooth, comfortable ride, while a firmer secondary rate helps soak up larger impacts and reduce bottoming. Critically, a key differentiator of Rock Jock's dual-rate springs is the positioning of the crossover point, so that a portion of the softer initial rate is active at ride height before crossing over to the firmer secondary rate deeper into the travel. This tuning detail translates to a spring that genuinely performs both on paved roads and on demanding trails — not just one or the other.

Platform Coverage: JL, JK, TJ, and JT Gladiator

Rock Jock engineers their coil springs for specific platforms rather than offering one-size-fits-all solutions. Their lifted rear coil springs for the Jeep JL Wrangler lift a Sport or Sahara model 4 inches and a Rubicon model 2½ inches. Their 4-inch lift coil spring set for the 2020-and-up Jeep JT Gladiator directly replaces the factory coil springs and is designed to work with Rock Jock Johnny Joint® suspension systems or other manufacturers' 3- to 5-inch lift kits. That JT set features 4-inch lift front springs and 3-inch lift rear springs to level the vehicle and provide an improved ride. For JK Wrangler owners, Rock Jock lifted coil springs deliver 3.5 to 5 inches of lift.

Engineered to Integrate — or Stand Alone

Many Rock Jock coil springs are designed to work with their Johnny Joint suspension systems, as well as other manufacturers' lift kits — making them a versatile upgrade whether you're building a full Rock Jock system or simply refreshing worn factory springs with a quality lift option. Extensive research went into developing the perfect combination of rates and quality for the coil springs, resulting in the best combination of comfortable ride and excellent off-road performance. Each spring also receives a black gloss powder coated finish for long-term corrosion resistance.

Race-Proven Credibility

Rock Jock's coil springs aren't designed in isolation — they're the product of decades of real-world competition feedback. In 2001, John Currie took home the 1st place trophy in the Extreme Rock Crawling Championship Series in a RockJock-equipped Jeep TJ Wrangler — the first of many victories in rock crawling, Ultra 4, and desert racing categories. John Currie was honored to be included in the inaugural group of inductees into the Rock Motorsports Hall of Fame during the 2025 Trail Hero Event, and was additionally honored with a Living Legend Award. That competition heritage ensures every coil spring spec is validated against the toughest real-world conditions — not just a lab.