The Timbren GMRCK25D Suspension Kit is designed to enhance the rear suspension of your LML and L5P. Timbrens are the go to suspension upgrade for anyone using their truck as a truck! These helper springs work awesome on camper haulers, wood haulers and trucks with service boxes. Timbrens hollow rubber springs are engineered to deliver a progressive spring rate. In other words, the more weight that pushes down on the rubber springs (weight from a heavy load or trailer) the harder they work to prevent front-end sag.
Easiest to use: Rubber cushions absorb road shocks and automatically adjust to uneven loads or road conditions. Easiest to maintain: There are no airlines or fittings to allow leaks. Simply bolt the kit on and you are set for a lifetime of trouble free suspension.
Easiest to install: There are no holes to drill, no airlines to route and SES Kits can be installed in a matter of minutes using basic hand tools. The softer ride quality of todays trucks and the mediocre suspensions found on most trailers can cause excessive trailer sway, instability and suspension settling. Timbrens high performance suspension packages will ensure added safety and peace of mind.
2011-2021 2500/3500HD GMC/Chevy Gas and Duramax Trucks
GMRCK25D replaces the jounce rubber on the rear suspension of the 2011-2021 GMC Sierra and Chevy Silverado 2500HD and 3500HD pickup truck and cab and chassis models.
Eliminate Vehicle Squatting & Sagging
Cushion Road Shocks
This kit is rated at 8600 lbs capacity. Even though you’re increasing the spring rate by adding this upgrade, this does not increase the GVWR (Gross Vehicle Weight Rating). Please make sure that the load does not exceed the GVWR set by the manufacturer.
(NOTE: There should be a ½” to 1 ½” gap between rubber spring and axle to ensure unloaded ride quality.)