2018 Jeep Gladiator Rear 4" Lift Coil Springs (8865-40)

Fits

These springs are unique to the JT and not shared with any other vehicles, the Multi-rate design has a soft initial rate which prevents the spring from coming loose, even with long travel shocks. The ride rate is the average of the OEM spring rates to maintain adequate payload and towing capacity. Designed to be able to set solid (fully collapse) without overstressing the material and are pre-set from the factory meaning the springs will never sag or set.

Part Number: 8865-40

• Multi-rate coil springs allow for longer spring lengths and increased travel
• Spring rates are similar to stock to maintain payload and towing capacity
• Coil spring block heights are designed around common bump stop spacings to optimize wheel travel
• Frequency-balanced and tuned spring rates to maximize suspension performance on and off-road
• Abrasion-resistant black powder coat finish for maximum durability and corrosion resistance
• Sold in pairs

Like most other high-end long-travel coil springs on the market, Synergy takes advantage of multiple spring rates to increase the extended travel of the spring. Gone are the days when coil spring retainers are required to keep your springs from falling out on the trail. There is a common misconception on how multi-rate coil springs work, and why they would be preferred over linear-rate coil springs, and vice-versa.

In short, it depends on the application and what constraints we are working with. With the new JT platform now has a dual-rate coil spring with a softer initial rate used at unloaded ride height.  As the vehicle is loaded the spring rate increases to minimize sag and maintain payload capacity. 

Spring rates were kept similar to the stock Gladiator spring rates to maximize flex and traction off-road, in addition, you can maintain a payload and towing capacity similar to stock. 

Due to variances between Jeeps and how they are used, Synergy designed these springs to match the stock rake of a fully optioned Rubicon. If you want the vehicle to sit level (without the stock rake) when unloaded, our front coil springs will accommodate up to a .75" front coil spacer without requiring additional bump stop spacing (8017-075). This means that the Jeep's ride height and rake can be fine-tuned to get the perfect ride height without compromise. 

• Coil springs require proper bump stop spacing with Synergy 8057-10 Bump Stop Spacers.
• Lift heights are based off fully optioned Rubicon models. Other models will see more lift.
• Coil springs retain the stock rake of the vehicle.
• Up to .75 inch of front coil spring spacer can be added to level the vehicle using 8017-075 front coil spring spacers.
• Minimum bump stop spacing listed is the minimum amount of bump stop spacing required to prevent the springs from going into coil bind. Do not use less bump stop spacing.

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