This SES Suspension Upgrade fits the front suspension of a Chevrolet Silverado 1500 & GMC Sierra 1500 pickup truck (see below for full list of applications). We've engineered our hollow rubber springs to deliver a progressive spring rate. In other words, the more weight that pushes down on the rubber springs (weight from a snowplow or heavy aftermarket accessories such as a steel bumper) the harder they work to prevent front-end sag.
These improved my 04 1500 4x4 immensely! I have several hundred yards of gravel driveway, and these made it possible to push a light plow. Even unloaded, the truck handles and corners much better.