Rock Krawler 2005+ Ford F250/F250 Spring Progressive Add A Pack (Single) - Rear

This progressive rate spring pack from Rock Krawler is built with a unique spring design that changes its stiffness based on how much load is applied. It’s designed to work with your existing rear suspension on 2005 and newer Ford F250 and F350 trucks, specifically targeting the rear axle. The progressive nature means that at rest or under light loads, the springs offer a more compliant ride, but as you add weight or encounter rough terrain, they stiffen up to control body roll and prevent bottoming out. This makes it a solid option for trucks that see varied use, from daily driving to hauling heavy loads or off-roading.

The springs are constructed from high-strength spring steel, a material chosen for its ability to withstand repeated compression and extension cycles without losing its shape or load-carrying capacity. Rock Krawler uses a specific winding process to achieve the progressive rate, meaning the coils are spaced differently along the spring's length. This allows the spring to engage more coils as it compresses, effectively increasing its spring rate in a controlled manner. This approach helps to maintain a comfortable ride when the truck is unloaded while still providing the necessary support when it's working hard.

This is a single spring pack, intended to be installed on one side of the rear axle. When considering an upgrade like this, it's often beneficial to replace both sides simultaneously to ensure balanced suspension performance. While this pack is designed to integrate with your factory setup, always refer to the manufacturer's installation instructions for the most accurate guidance on proper fitment and any additional components or procedures that may be required for optimal performance and safety.