GMRAZT – Rear Axle SES Suspension Upgrade

GMRAZT - Rear Axle SES Suspension Upgrade

This SES Suspension Upgrade fits the rear suspension of a Pontiac Aztek, Buick Rendezvous Chevrolet Uplander (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 SUV, our hollow rubber springs adjust automatically to keep the vehicle level at all times.

This SES Suspension Upgrade replaces the jounce inside the coil spring. 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.

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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


Buick Rendezvous
2002-2007
All 2WD Models Except With Air Shocks
Buick Terraza
2005-2008
All 2WD Models Except With Air Shocks
Chevrolet Uplander
2005-2008
2WD Only
Chevrolet Venture
1997-2004
All 2WD Models Except With Air Shocks
Oldsmobile Silhouette
1997-2004
All 2WD Models Except With Air Shocks
Pontiac Aztec
2001-2007
All 2WD Models Except With Air Shocks
Pontiac Montana
1999-2006
All 2WD Models Except With Air Shocks
Pontiac Trans Sport
1997-1998
All 2WD Models Except With Air Shocks
Saturn Relay
2005-2007
2WD Only
Pontiac Trans Sport
1997-1998
All 2WD Models Except With Air Shocks

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