GMRP30HD - Rear Axle Timbren SES Suspension Upgrade

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.

Product Features

  • Eliminate Vehicle Squatting & Sagging
  • Cushion Road Shocks
  • Improve Handling
  • Satisfaction Guarantee
  • Lifetime Warranty
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Customer Reviews

"The Timbren system is the answer for rear end sag and soft handling! My 35ft 5th wheel handles much better, and I recommend Timbren without reservation."

- Larry V. - SD

“Timbren's work amazing! Absolutely as good or even better than air bags! Did it myself and only had time to drink 2 beer doing it! Easy install. Thanks for the advice. Simple yet very effective.”

- Jonny K - NB

Fitment Checklist

  • Chevrolet/GMC P30/32/42/60
    • Chevrolet/GMC B Chassis
    • Workhorse P30/32, W20
    • Workhorse P60
  • 1975-1999
    • 1975-1999
    • 2000-2005
    • 2000-2003
  • For Cube Van & Cutaway Van Chassis
    • For Cube Van & Cutaway Van Chassis
    • All Models with Coil Spring Front Suspension
    • All Models with Coil Spring Front Suspension