This SES Suspension Upgrade fits the front or rear suspensions. Timbren engineered their hollow rubber springs to deliver a progressive spring rate. In other words, the more weight that pushes down on the rubber springs the harder they work to prevent rear end sag. Whether you’re pulling a trailer or carrying a heavy load in the bed of your truck, Tiimbren's hollow rubber springs adjust automatically to keep the vehicle level at all times.
This SES Suspension Upgrade replaces the jounce stop on the frame. Its unique design ensures superb ride quality – loaded or unloaded. (There should be a 1/2” to 1-1/2” gap between rubber spring and axle to ensure unloaded ride quality.) Unlike other auxiliary spring systems, the SES Suspension Upgrade guarantees the best of both worlds.
These replaced stock jounce stops on my truck. Installation was breeze, a 15mm wrench and a 17mm deep socket. The stock jounce was 4 in, the Timbrens' are 7 in tall. Left me just under 3/4 of an inch to axle stop. Exactly what I needed to eliminate rear sag when towing my travel trailer.