Applications - 4WD

The job of a car suspension is to maximize the friction between the tyres and the road surface, to provide steering stability with good handling and to ensure the comfort of the passengers.

Vehicle suspension has three main jobs: smooth out bumps, keep tires touching the road and control vehicle stability. The spring absorbs the energy of forces acting on your wheels.

Studying the dynamics of suspension, its role is to carry weight, absorb energy, dampen shock and allow the frame of the vehicle to move while the tyres follow the terrain and maintain tyre contact. Vehicle dynamics covers three important principles - road isolation, road holding and cornering.

Off-road vehicles

The suspensions of off-road vehicles tend to be even more complicated than your conventional passenger vehicle because the wheels are usually bigger, and the terrain offers nastier bumps.

The primary goal of a suspension modification is to raise the body and frame of the vehicle to create additional ground clearance. This also provides room for larger tires and increases suspension travel.

­As a car hits a bump, a shaft is driven upward in the oil that fills the shock. The piston inside the shock regulates how quickly the shaft moves up (compresses) and down (rebounds). By choosing the correct compression and rebound for each specific vehicle, the driver is able to better manoeuvre the vehicle. To keep the oil from foaming and losing its ability to compress and rebound, a shock is pressurized with nitrogen.

There are two fundamental parts to a suspension system: Springs and Shock Absorbers.


Today's springing systems are based on one of four basic designs:

  • Coil springs store energy and release it to absorb shock or maintain a force between two contacting surfaces.
  • Leaf springs consist of several layers of metal (called "leaves") bound together to act as a single unit. 
  • Torsion bars use the same principle as coil and leaf springs, except they act by twisting along their axis to provide spring force. One end of a bar is anchored to the vehicle frame. The other end is attached to a wishbone, which acts like a lever that moves perpendicular to the torsion bar.
  • Air springs consist of a cylindrical chamber of air positioned between the wheel and the car's body, and use the compressive qualities of air to absorb wheel vibrations.

Shock absorbers

Springs are only part of the picture. A shock absorber controls unwanted spring motion by slowing down and reducing vibrations by turning kinetic energy into heat.

When the car wheel encounters a rut off-road, or a bump on-road and causes the spring to coil and uncoil, the energy of the spring is transferred to the shock absorber, down through the piston rod and into the piston. This slows down the piston, which in turn slows down the spring.

Our Aussie Ryder shocks are velocity-sensitive. This means that the faster the suspension moves, the more resistance the shock absorber provides. This enables shocks to adjust to road conditions and to control all of the unwanted motions that can occur in a moving vehicle, including bounce, sway, brake dive and acceleration squat.

This is a phenomenon called Axle Tramp (or Wheel Hop). Usually occurring from an incorrectly set up suspension system and the axle loads and unload itself rapidly.

Get in touch now and let's get you on the road!

Find out more about our in-house Aussie Ryder Shocks and pricing here.

We stock and supply a huge range of suspension components and brands to suit every budget.

If you are enquiring about GVM Upgrades, another brand or something different, contact us here.

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  • Since 1975 means more people trust us with their investment
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  • 24 Month / UNLIMITED km nationwide warranty on Ultimate shock absorbers
  • LIFETIME warranty on all springs
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Key Advantages

Design the Ultimate Suspension for your 4WD

With over 45 years of experience The Ultimate Suspension exports across the globe and is arguably the most trusted name in suspension and vehicle dynamics upgrades.

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What Our Clients Say

Jack F.
(2006 Nissan Pathfinder)
Fantastic, I'm totally blown away by Testimonial Generator. more
Rick E
(2006 Nissan Pathfinder)
Ultimate Suspension saved my business. This is simply unbelievable! Man, this thing is getting better and better as I learn more about it. more
Vivie X
(2006 Nissan Pathfinder)
Ultimate Suspension was worth a fortune to my company. I made back the purchase price in just 48 hours! Thanks Ultimate Suspension! more
Nona D
(2006 Nissan Pathfinder)
Definitely worth the investment. more
Michael & Joanne McCulkin
(Mitsubishi Canter All Terrain Warrior 4WD Coach)

Tri State Safaris operates 4WD tours Australia wide in our Mitsubishi Canter All Terrain Warrior 4WD coach. The vehicle is only 12 months old but has always been in need of a better ride. We ... more

Michael Hall
(2006 Nissan Pathfinder)
Being dissatisfied with the very rigid ride from the original suspension on my 2006 Nissan Pathfinder, and following discussions with yourselves, I decided to have the suspension changed to The Ultimate Suspension Gas Shock Absorber System. ... more
Charlie C

These guys are absolutely fantastic to go to. I am really glad that I found them. Ken and his team spent two hours with me when I first turned up for a quote, making ... more

Ali Raza H

I am from Pakistan. I have had four suspensions from ULTIMATE and love the ride on all four hiluxs.

Michael G

five stars, best improvement for my Triton. Got the lift and suspension upgrade 5 years ago and a rebuild this year. Car drives much better now.

Russell G

I am so happy with my Ultimate Suspension, I wouldn't buy anything else in the future. Quality products, great service, not one issue with my lift kit which has now done 150000 Kms, car still ... more

Rod C
(VW Amarok)

I had extensive suspension and other 4WD accessories supplied and fitted to an Amarok to accommodate a Trayon camper and outback travel. The advice provided was top class, the products supplied were excellent and ... more

Verity S
(Pajero Sport GVM)

Friendly, experienced and knowledgable staff. Did exactly what was needed, no hidden extras. Very happy and loved the enthusiasm of the staff who clearly take pride in the service they offer.


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