Do I Need a GVM Upgrade?

If you’ve added accessories, carry gear, or tow a caravan, it’s very easy to push a 4WD close to or over its legal weight limit without realising.
A lot of people assume a suspension upgrade fixes the problem, but that’s not always the case.

This page will help you understand your vehicle’s weights in plain English, work out whether you might be close to GVM, and decide what the right next step is for your setup.

What Is GVM? (In Plain English)

GVM stands for Gross Vehicle Mass.
It’s the maximum legal weight your vehicle is allowed to be when fully loaded.

That includes:

  • The vehicle itself

  • Fuel

  • Driver and passengers

  • Accessories (bullbar, canopy, drawers, roof rack, etc.)

  • Gear and tools

  • Tow ball weight if you’re towing

Most 4WDs don’t start overweight — they become overweight over time as accessories and touring gear are added.

GVM Self-Check Tool (Guide Only)

The calculator below provides a general indication of whether your setup is close to or over GVM.

It is a guide only — final weights should always be confirmed on a certified weighbridge.

GVM Upgrade Calculator

Determine whether your vehicle requires a GVM upgrade based on its unladen mass.

kg
kg

Breakdown
Kerb weight
Passenger mass
Total unladen mass
Rated GVM
Difference

How Busselton Auto Repairs Can Help

We specialise in Dobinson-certified GVM upgrades for touring, towing, and work vehicles.

Our approach is:

  • Practical and load-focused

  • Based on how you use your vehicle

  • Fully compliant and certified

  • Clearly explained, with no pressure

We’ll help you understand your options and ensure your setup is safe, stable, and legal.

Next Step

If you’d like us to properly review your setup, the next step is a GVM assessment.

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Frequently Asked Questions about GVM Upgrades

  • A Dobinsons GVM upgrade enhances your vehicle's legal weight-carrying capacity through the expert installation of a specially designed Dobinsons suspension kit. This kit, rigorously tested and approved in Australia by the Department of Infrastructure, replaces the factory springs, shock absorbers, and other standard suspension components. Additionally, tyre upgrades may be necessary.

    Unlike a standard aftermarket suspension kit, the Dobinsons GVM upgrade not only raises your vehicle's ride height from its original factory setting but also significantly boosts its payload capacity. This results in improved handling and stability, contributing to a safer driving experience.

  • The Gross Vehicle Mass (GVM) is the maximum weight your vehicle can safely carry, including the weight of the vehicle itself, passengers, cargo, and any accessories. Here's how you can determine if your vehicle is over its GVM:

    1. Check the Manual:
      Consult your vehicle's manual or look for a placard on the vehicle that displays its GVM. This information will give you the maximum weight your vehicle can carry.

    2. Weigh Your Vehicle:
      Take your vehicle to a weighbridge or a certified weighing station. Drive your vehicle onto the scale, ensuring that all passengers and cargo are inside as they would be during normal operation. We recommend that if you are going to be towing, you have the caravan etc atteched while weighing. The scale will measure the weight of your vehicle. Compare this weight to your vehicle's GVM. If it exceeds the GVM, your vehicle is overloaded.

    3. Calculate Load:
      If you know the weight of your cargo, you can manually calculate whether your vehicle is over its GVM. Simply add the weight of the passengers, cargo, and any accessories to the weight of the vehicle when it's fully fueled. If this total weight exceeds the GVM, your vehicle is overloaded.

    4. Suspension Sag:
      If your vehicle is visibly lower at the rear or shows signs of suspension sagging, it might be an indication that it's carrying too much weight. This could be a sign that your vehicle is over its GVM.

    If you are unsure or would like help calculating this, our team are here to help.

  • Contact our friendly team. We will then be able to determine the best course of action and what suspension you will need for your vehicle.

  • Option 1: Twin-Tube Shocks:

    These are the initial choice in the range (the standard replacement) and come at the lowest price point. They serve as a direct bolt-in replacement for both standard height and raised suspensions. Despite being the first option in the range, they are constructed to endure our harsh Aussie climate and conditions, making them a solid choice.

    Option 2: IMS Shocks - Monotubes.

    This stands as the mid-range option, designed to offer enhanced performance compared to the twin-tube shocks. The IMS option excels in assisting with corrugated roads, extended trips, off-road driving, and towing. Moreover, these shocks are adjustable, allowing us to fine-tune the heights to match your requirements.

    Option 3: Monotube Remote Reservoir (MRR) - 3-Way Adjustable.

    This represents the top-tier choice, tailored for optimal performance and equipped with a 3-way damping adjustment system. These shocks bring about substantial reductions in shock absorber friction, leading to improved vehicle ride and damping performance.

  • Yes, we can do a 2” lift with the GVM upgrade.

  • Currently, the Department of Infrastructure and Transport does not endorse or approve upgrades to the Gross Combination Mass (GCM). Similarly, Dobinsons Spring & Suspension also does not endorse or approve any GCM upgrades that are specific to individual states.