Timbren SES Suspension Enhancement System fits Select Mack Medium Duty Truck Rear Suspensions

This SES Suspension Upgrade can be adapted to fit the rear suspension of Select Mack MD, Freedom, and Midliner models (see below for full list of applications). Each laser cut piece of steel is precision bent and powder-coated to ensure a quality fit. Weve engineered our 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, and help stabilize the load.