TURMDB Peterbilt Rear Suspension Enhancement

  • $ 531.00
  • Save $ 94

Timbren Vehicle Suspension - TURMDB

  • Timbren
  • Jounce-Style Springs
  • Heavy Duty
  • Rear Axle Suspension Enhancement

15,000-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use.



  • Improves suspension, handling, and safety
  • Provides additional support as needed so you always have a smooth, comfortable ride
    • Allows the leaf spring ample movement while cushioning light loads
    • Becomes more rigid as more weight is added
      • Increases stability - providing great performance while hauling heavy loads
      • Reduces vehicle sag
  • Works independently - side-to-side
    • Helps compensate for off-center loads
    • Reduces body roll when swerving and turning corners
  • Acts as shock absorbers, taking the brunt of bumps and rough roads
    • Extends the life of your vehicle's suspension
  • Requires 2 kits
  • Includes 2 hollow rubber springs vehicle-specific brackets and hardware for simple installation
    • Installs directly onto frame
    • Requires some drilling


  • Capacity: 15,000 lbs
    • Do not exceed the vehicle's weight-carrying capacity
  • Limited lifetime warranty
  • Satisfaction guarantee

Reduced rear axle sag with Timbren suspension enhancement

Whether you're hauling heavy loads in your bed or cargo area or towing a trailer, you will often see the rear of your vehicle sag while the front end rises. In these cases, the rear axle is handling not only the weight of the cargo, but also more of the vehicle's weight. Because less weight is on the front axle, the front tires are making less contact with the road. Overall vehicle handling - traction, steering, and braking - is negatively affected. But the resistance from Timbren's Suspension Enhancement System works with your factory suspension to keep your vehicle level and improve your driving experience.

Diagram of the Timbren spring installed

The Timbren system comes with custom-fit brackets that are bolted onto each frame rail above your rear axle. Hollow rubber springs are bolted to the bottom of the bracket and hang down to where the bottom of the leaf spring sits, 1" above the axle. The inch of clearance allows the existing factory suspension to operate normally under light loads and standard terrain, ensuring the smooth, comfortable ride that you are used to.

Action of a standard Timbren rubber spring

Timbren Suspension Enhancement Systems are designed to work progressively. When the hollow rubber springs are compressed, the convoluted design causes them to quickly collapse along the folds. Once the folds are compacted, the stacked barrel shape increases resistance, stiffening the suspension and keeping your vehicle level.

Timbren suspension system works to prevent body roll

Each hollow rubber spring works independently to support the driver's-side or passenger's-side of your vehicle. This is helpful when you swerve or make sharp turns. Each spring is activated when it is needed, so body roll is greatly reduced. The independent action also works well when you are hauling off-center loads.

Trailer swaying as it is towed behind a truck

Because your vehicle handles better with the springs, less turbulence will be passed along to the trailer and this helps to keep the trailer in line. Your driving comfort is further enhanced if the trailer does begin to sway (from a gust of wind or a passing semi) because the movement from the trailer is not transferred to your vehicle. This also works to make the sway subside more quickly.

An empty truck on a bumpy road without Timbren SES

Another great feature of the rubber construction is that the springs absorb most of the road shock, creating a smoother, more stable ride overall. Wear and tear on the factory suspension is also lessened because the rubber springs work to prevent bottoming out on rough roads.


Timbren Suspension Enhancement Compared to the Competition

Timbren's Suspension Enhancement Systems are much easier to install than air springs - there are no air hoses to run, no compressors or gauges to hook up, and no manual adjustments to make. The rubber construction makes Timbren's springs more elastic than similar products constructed of microcellular urethane. And more elasticity allows for a more comfortable ride because the rubber has more travel.

URMDB - Rear Suspension Enhancement System with Aeon Hollow Rubber Springs by Timbren

TURMDB Installation InstructionsInstallation Details TURMDB Installation instructions

This Product Fits The Following Vehicles

2004 - 2015 Hino 145

2004 - 2015 Hino 165

2004 - 2015 Hino 185

2004 - 2015 Hino 238

2004 - 2015 Hino 268

2004 - 2015 Hino 338

1987 - 2008 Peterbilt 338

1987 - 2008 Peterbilt 357

1987 - 2008 Peterbilt 359

1987 - 2011 Mitsubishi-Fuso FH

1987 - 2011 Mitsubishi-Fuso FK

1995 - 1997 Freightliner FL-Series FL50, FL60, FL70, and FL80

1998 - 2008 Freightliner FL-Series FL60, FL70, and FL80

1990 - 1996 Isuzu F-Series FRR, FTR, and FVR

1990 - 1995 International Trucks 4600 Series LoPro

1990 - 2001 International Trucks 4700 Series LoPro

1988 - 1996 Chevrolet W-Series W7 and W7000

2007 - 2008 Sterling SC7000 without TUFTRAC rear axle

2007 - 2008 Sterling SC8000 without TUFTRAC rear axle

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