Rear Suspension Enhancement Kit

Part Number: GMRP30HD

Price: $398.87

Estimated to ship in 1-2 days from closest warehouse!

Rear Suspension kit. 

This SES Suspension Upgrade fits the rear suspension of a Chevrolet, GMC & Workhorse P Series chassis. Each laser cut piece of steel is precision bent and powder-coated to ensure a quality fit. 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 the harder they work to prevent rear end sag. Whether you’re pulling a trailer or carrying a heavy load in the back of your vehicle, our 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 ½” to 1 ½” gap between rubber spring and frame to ensure unloaded ride quality.) Unlike other auxiliary spring systems, the SES Suspension Upgrade guarantees the best of both worlds.

Product Features

  • Eliminate Vehicle Squatting & Sagging
  • Cushion Road Shocks
  • Improve Handling
  • Satisfaction Guarantee
  • Lifetime Warranty
  • Chevrolet/GMC P30/32/42/60 1975-1999. For Cube Van & Cutaway Van Chassis
  • Chevrolet/GMC B Chassis 1975-1999. For Cube Van & Cutaway Van Chassis
  • Workhorse P30/32, W20 2000-2005. All Models With Coil Spring Front Suspension
  • Workhorse P60 2000-2003. All Models With Leaf Spring Front Suspension


Mill Supply has been the #1 supplier of step van parts for over 30 years. If you have a Workhorse, Utilimaster, Morgan Olson or other type of walk-in van you have landed on the right page. You will not find a more complete listing of parts for stepvans anywhere! With research and development on-the-go, new products are constantly being added to keep up with the growing industry. You can count on great customer service, fast shipping, and discount prices when you shop with us. It doesn't matter if you use your truck on-the-job, for deliveries, or run a food truck, you can count on Mill Supply to keep your vehicle in top shape. If you have any questions don't hesitate to either contact us via email or give us a call at 800-888-5072 between 8:00 a.m. - 5:00 p.m. E.S.T. and one of our experienced representatives will be happy to help you.

Estimated Shipping Dimensions: 11" x 8" x 6"

Weight: 13.09 lbs