Timbren Suspension Enhancement Systems

Custom Fit Vehicle Suspension

Demonstration of How Timbren Decreases Vehicle Sag

Timbren Suspension Enhancement Systems (SES) are easy-install kits created to provide additional support for your vehicle's suspension. These kits are designed to enhance the suspension, handling and safety of your vehicle, and also to reduce sag from heavy loads by becoming stronger and more resistant as the weight of the load increases.


Depiction of Vehicle Role
  • Levels vehicle
    • Increases stability and handling, especially when you are hauling heavy loads
    • Decreases vehicle sag, thereby increasing wheel traction
  • Each spring works independently of other springs installed on the vehicle
    • Helps to handle off-center loads in vehicle
    • Reduces vehicle roll
  • Prevents bottoming out
  • Dramatically increases your vehicle suspension's lifetime
    • Rubber springs absorb substantial amount of shock from the road
  • Does not affect unloaded ride of vehicle
    • Allows vehicle to use its own suspension when unloaded


Depiction of Trailer Sway

Use Rear Application Kits For:

  • Towing - most commonly used with 5th-wheel and gooseneck towing setups
    • SES kits enhance vehicle ride and performance by providing weight distribution and sway control
    • Valuable addition to the suspension of any vehicle that is towing a significant weight relative to the vehicle (for example, an SUV hauling a pop-up camper)
  • RVs
  • Salting trucks
  • Vehicles with unusual loads
    • Aerial trucks
    • Work vans with internal shelves serving as worktops and storing equipment
    • Pickup trucks used regularly for hauling loads that shift

Vehicle with Snowplow

Use Front Application Kits For:

  • Snow removal vehicles
  • Vehicles with heavy front-mount accessories
    • Plows
    • Grille/brush guards
    • Winches

Not Applicable:

  • SES kits are not designed to decrease sag on an already poor suspension
    • Kits are intended to assist suspension in good working condition
  • Kits are not designed to increase weight-carrying capacity of vehicle

How Does It Work?

The smoothness of the ride results from the rubber construction of the springs.

Compression and Expansion of Timbren's Aeon Spring


  • When re-expanding, rubber absorbs the shock from the road, providing a cushioned ride for your vehicle
  • Rubber, unlike other materials, will always bounce back to full height
    • The quality of your smooth ride will not deteriorate
Diagram of a Loaded and Unloaded Convoluted Spring

Progressive Support Comes from the Convoluted Springs

  • Kits come with single-, double- or triple-convoluted springs
  • Springs quickly collapse along the fold
  • Once the spring collapses along the folds, the remaining "barrels" become increasingly difficult to compress, thereby adding strength to the vehicle's suspension
    • Springs effectively get stronger with added weight


Timbren SES kits can be installed in only a few simple steps.

Installation Time

  • Light Duty: 20 - 60 minutes per axle
  • Heavy Duty: 60 - 120 minutes per axle

Tools Required

  • Jack
  • Jack stand
  • Typically, a basic tool kit is needed. However, some kits require additional tools, which can be found at most hardware or auto supply stores.

Typical Parts Included in a Timbren SES Kit

Timbren SES Kit Parts

Kit comes with parts needed for installation on one axle.

  • 2 Aeon rubber springs
    • Replace vehicle's OEM bump stops
  • Vehicle-specific brackets
    • Upper and lower (if necessary)
  • All hardware

Installation Steps

  • Raise the vehicle and remove the tire and wheel (optional) so that the vehicle's suspension hangs freely
  • Remove factory bump stop
  • Assemble Timbren spring and bracket as shown in instructions
  • Mount spring and bracket into existing bump stop holes
  • Reinstall tire and wheel (if removed)
  • Lower vehicle and check clearance
    • "Clearance" is the distance between the rubber spring and the axle

Drawing of Typical ClearanceDrawing of Typical Clearance in a Heavy-Duty Application

Recommended Clearance

  • Rear applications
    • 1/2-Ton and 3/4-ton trucks - 1" clearance
    • 1-Ton trucks - 1/2" clearance
    • Heavy-duty applications - no clearance
  • Front applications
    • 0" - 1" Clearance

Additional Clearance Information

If your spring does not have the recommended clearance, yet the ride of your vehicle is satisfactory, then ensuring the recommended clearance is not necessary.

  • If the spring is touching at all times, it will not damage the vehicle. The rubber spring was designed for contact.

If you do not have the recommended amount of clearance or your ride is not satisfactory, you can take a few steps to resolve the problem.

  • First, install or remove any supplied spacers to increase or decrease space between rubber spring and axle
  • If spacers do not resolve the problem, call etrailer.com's Customer Service department with this information at hand:
    • Year, make and model of your vehicle
    • Whether it is 2- or 4- wheel drive
    • Measurement from axle to the vehicle frame (where bump stop is located)
  • Timbren has a satisfaction guarantee that ensures you will be provided with the correct parts for your vehicle. etrailer.com's Customer Service department can help you get the replacement parts you need to get a satisfactory ride.


Timbren SES kits have a limited lifetime warranty.

  • Warranty is for the lifetime of the vehicle on which the kit was originally installed
  • Severe-use vehicles have 5-year or 250,000-mile warranty
    • Tow truck
    • Dump truck
    • Aerial lift
    • Snowplow trucks
    • Pickups with slide-in camper
  • Warranty is strictly related to parts (does not include shipping or labor)



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