Mill Supply, Inc.

Call us:


Stepvan Parts
Timbern Rear Suspension Kit - Workhorse - GMRP30

Timbern Rear Suspension Kit - Workhorse - GMRP30
Qty UM Part Number Description Price


Timbern Rear Suspension Kit. 

This SES Suspension Upgrade fits the rear suspension of a Chevrolet C30, GMC C35/3500 and Workhorse P30 chassis (see below for full list of applications). 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 C30 Pickup 1968-1972 2WD Only
  • Chevrolet P30/32/42/60 1975-1999. For Motorhome Chassis
  • Chevrolet B Chassis 1975-1999. For Motorhome Chassis
  • GMC C35/3500 Pickup 1968-1972 2WD Only
  • Workhorse W42 2006-2017. All Models
  • Workhorse P30/32, W20 2000-2005. All Models With Coil Spring Front Suspension
  • Workhorse P30/42/60 2000-2005. All Models With Bump Stop On Frame

Other Descriptions

9.23 Pounds. 9x7x6 inches
Manufacturer names or numbers are for reference only and do not indicate OEM parts.

Other Pricing