GMRC20 – Rear Axle SES Suspension Upgrade

GMRC20 - Rear Axle SES Suspension Upgrade

This SES Suspension Upgrade fits the rear suspension of a Chevrolet C10/C20 & GMC 15/25 pickup truck (see list 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 bed of your truck, 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 axle to ensure unloaded ride quality.) Unlike other auxiliary spring systems, the SES Suspension Upgrade guarantees the best of both worlds.

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Product Features

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

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 Blazer
1973-1974, 1990-1992
2WD Only
Chevrolet Blazer K5
1975-1984
2WD Only
Chevrolet C10 Pickup
1973-1986
2WD Only
Chevrolet C20 Pickup
1973-1986
2WD Only
Chevrolet R10 Pickup
1987
2WD Only
Chevrolet R20 Pickup
1987
2WD Only
GMC C15 Suburban
1975-1978
2WD Only
GMC C15/C1500
1973-1983
2WD Only
GMC C15/C1500 Suburban
1973-1974
2WD Only
GMC C1500
1980-1986
2WD Only
GMC C1500 Suburban
1979-1992
2WD Only
GMC C25 Suburban
1975-1978
2WD Only
GMC C25/C2500 Pickup
1973-1978
2WD Only
GMC C25/C2500 Suburban
1973-1974
2WD Only
GMC C2500 Suburban
1979-1992
2WD Only
GMC Jimmy
1973-1984
2WD Only
GMC R1500 Pickup
1987
2WD Only
GMC R1500 Suburban
1987-1991
2WD Only
GMC R2500 Suburban
1987-1991
2WD Only

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