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Expert 4x4 Suspension Upgrade Solutions for Towing , Work or Touring

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Specialist 4x4 and SUV suspension services for enhanced load carrying and safety.

GVM Upgrades

Upgrade your vehicle's GVM for improved performance and safety. We offer our own GVM Central Brand with premium components PLUS packages from the best Brands including Dobinsons, Tough Dog, Eibach, Bilstein, EFS, Raw 4x4 and More

SSM GVM Upgrades –

What You Need to Know

An SSM (Second Stage Manufacture) GVM upgrade is a federally approved modification that increases your vehicle’s Gross Vehicle Mass (GVM) rating before or after registration.

In simple terms, it legally allows your vehicle to carry more weight – including passengers, accessories, tools, fuel, and towing equipment – without breaching compliance or safety laws.

How it works

Engineered & Certified – The upgrade is designed, tested, and certified to meet strict Australian Design Rules (ADR).
Pre-Registration (new vehicles) – The GVM upgrade can be applied before first registration. Once done, the vehicle is registered with the new GVM capacity nationwide.
Post-Registration (in-service vehicles) – Upgrades can also be carried out on vehicles already registered. In this case, compliance is certified at a state or territory level.

Why it matters

Legally carry more load – Avoid fines, defects, and insurance issues caused by overloading.
Safer handling & braking – Upgraded suspension and components are tailored to manage extra weight on and off-road.
Nationwide recognition – Pre-reg SSM upgrades are recognised across all Australian states and territories.
Tailored to your needs – Whether you’re a tradesperson, fleet operator, touring family, or towing heavy loads, SSM upgrades provide a compliant solution.

When you’re towing or carrying heavy loads, two critical limits apply to your vehicle: Gross Combined Mass (GCM) and Braked Towing Capacity (BTC).

GCM (Gross Combined Mass): The maximum legal weight of your fully loaded vehicle plus whatever you are towing.
BTC (Braked Towing Capacity): The maximum weight your vehicle can legally tow when the trailer is fitted with its own brakes.

Why upgrades matter

Even if you upgrade your GVM (Gross Vehicle Mass), you can still be restricted by the factory GCM or BTC limits. Very few suspension manufacturers offer GCM and BTC upgrades due to the complex testing required.

What a certified upgrade does

GCM Upgrade – Increases the total allowable combined weight of vehicle + trailer, letting you safely tow while still carrying your gear.
BTC Upgrade – Lifts the legal towing capacity, so you can tow heavier caravans, boats, or trailers in line with your vehicle’s engineering.
Safety & Compliance – These upgrades are tested to stringent Standards and Procedures and Australian Design Rules (ADR) and can incorporate stronger towbars, chassis strengthening, suspension, driveline and braking solutions engineered to handle the extra mass.
Certified & Insurable – A properly engineered and approved upgrade keeps your vehicle compliant with road authorities and ensures your insurance remains valid. (Always check with your insurer)

Benefits for you

Tow bigger caravans or trailers legally and safely.
Carry more gear without sacrificing towing ability.
Peace of mind knowing your vehicle meets strict compliance requirements.
We have fully tested and approved GCM upgrades for a range of makes and models including....... Ford F150, Chevy Silverado, Toyota Landcruiser, Y62 Patrol PLUS........Tow Capacity (BTC) upgrades for Landcruiser 70, 200 and 300 series and Y62 Patrol

GCM & Tow Capacity Upgrades

Post-Registration GVM Upgrades (State Certified)

If your vehicle is already registered, you can still increase its Gross Vehicle Mass (GVM) through a state-based engineering certification process. This is known as a post-registration GVM upgrade.

Unlike federally approved pre-registration upgrades, post-registration upgrades are assessed and signed off by an authorised automotive engineer under the National Code of Practice (NCOP) or relevant state legislation.

Key points for consumers:

State-Specific Recognition – Once certified, the upgraded GVM is valid in the state or territory where the modification was approved. Recognition may vary if the vehicle is transferred interstate.
Engineering Certification – An approved engineer inspects the vehicle, confirms the modifications (usually upgraded suspension and associated components), and issues a compliance certificate.
Legal Compliance – The new GVM rating is recorded with your state road authority, ensuring the vehicle can be legally driven with the higher carrying capacity.
Insurance & Safety – With proper certification, your vehicle remains insurable and compliant, while also improving safety when carrying heavy loads or towing.
Flexibility – Ideal for tradies, fleets, or tourers who add gear after purchase and quickly exceed the factory GVM. When towing caravans, hauling tools, or fitting accessories, stock payload limits are often exceeded. Overloading risks include

· Braking inefficiency

.Steering instability

· Unsafe towing performance

· Suspension fatigue and sagging

Our Engineer designed and fully approved kits raise the allowable payload so you can fit bull bars, canopies, long-range tanks, or tow heavy trailers—while staying compliant across all Australian states and territories

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GVM Upgrade Packages

A GVM (Gross Vehicle Mass) upgrade increases the legal load capacity of your vehicle by fitting an approved suspension system. This means you can safely add accessories such as bull bars, roof racks, winches, canopies, tools, and touring gear without breaching compliance. In some cases, additional upgrades to brakes, chassis, or tyres are also required to meet safety standards.

If your vehicle is frequently near or above its factory GVM rating, an upgrade is strongly recommended. Overloading not only makes your vehicle unroadworthy but can also void your insurance. For vehicles already registered, post-registration GVM upgrades require certification by an authorised engineer in your state or territory.

It’s important to note that GVM upgrades can affect ride comfort, especially when the vehicle is lightly loaded. All components in the kit must be installed as supplied, without modification, to ensure compliance and safety.

Not every vehicle is suitable for a GVM upgrade, which is why a professional assessment of your load requirements is essential. At GVM Central, our approved fitment facilities guide you through the process to ensure the upgrade is tailored to your needs.

We provide both Pre-Registration (federally approved SSM) and Post-Registration (state-certified) upgrades for a wide range of vehicles. Below are just some of the popular models we support:

Toyota LandCruiser 79 Series

Upgrades available: 3,780 kg, 3,950 kg, and 4,200 kg
Suspension options: heavy-duty twin-tube shocks through to fully adjustable remote reservoir systems.
Standard inclusions: offset radius arm bushes, heavy duty shackles and bushes
Optional extras: rear airbags for additional load support.
For 4200kg option upgraded tyres are required

Toyota Prado 250 Series

Upgrades available: 3,550 kg and 3,800 kg
First in Australia to achieve SSM pre-registration approval.
Engineered using in-house designed springs paired with Dobinsons IMS shocks.
Standard inclusions: front upper control arms, rear sway bar upgrades, axle modifications, and in-coil airbags.
3,800 kg package adds bellow-style rear airbags and an adjustable rear panhard rod.

Toyota LandCruiser 300 Series

Upgrades available: 3,820 kg, 4,000 kg, and 4,200 kg
Suspension: wide range of shocks for comfort, touring, and off-road use.
Standard inclusions: upgraded front upper control arms, rear sway bar links, and often an adjustable panhard rod.
Rear load assist airbags optional.

Toyota LandCruiser 200 Series

Upgrades available: 3,650 kg and 3,850 kg (most popular)
Options include monotube and remote reservoir shocks.
Recommended options: upgraded front upper control arms and diff drop for correct suspension geometry.
Packages from $3,450 drive-in, drive-out engineered.

Nissan Y62 Patrol

3,850 kg and 4,200 kg post-registration, or 4,200 kg pre-registration (SSM recognised nationally).
Features: upgraded front & rear coils, airbags, front upper control arms, HBMC pressure recalibration,
heavy-duty rear lower control arms, and Cat6 indicators (for NB1 ADR compliance).
Ideal for touring setups with caravans and heavy loads.
GVM Central have the most comprehensively tested Y62 GVM package in the market

Toyota Tundra

Upgrades available: 3,850 kg and 4,200 kg
First in Australia with approved SSM GVM upgrades.
Built with GVM Central’s custom wound springs and Eibach Pro Truck shocks.
Standard inclusions: upper control arms, rear sway bar upgrades, axle mods, and in-coil airbags.
4,200 kg package adds bellow-style rear airbags and optional heavy-duty front driveshafts.
Premium products for a premium ride in a premium vehicle

RAM 1500 DT

Upgrade to 3,920 kg
Features: upgraded coil springs front and rear, sway bar mods, load-assist airbags, and heavy-duty front upper control arms.
Rear axle load increased to 2,200 kg. up from the paltry factory 1769kg

RAM 1500 DS

Upgrade to 3,889 kg
Features: upgraded coil springs, sway bar mods, load-assist airbags, and heavy-duty upper control arms.
Rear axle load increased to 2,120 kg.
5-seat models can also have the centre seat re-installed.

RAM 2500 DJII

Upgrade to 5,462 kg
Comprehensive kit includes: heavy-duty coil springs, shocks, front sway bar spacer blocks, sway bar mounts,
rear airbags, and a heavy-duty steering damper kit.
NB2 ADR category change

Chevrolet Silverado 1500

Upgrades available: 3,850 kg and 4,200 kg
Developed with custom rear leaf packs for a balance of ride comfort and load-carrying capacity.
Shock and airbag options available.
Unique front lower control arm upgrades included on the 4,200 kg package.
Rear axle load raised from 1,724 kg to as much as 2,400 kg.

Ford F-150

Upgrades available: 3,850 kg and 4,050 kg
Suspension options: Eibach or Bilstein shocks with optional EZFIT airbags.
Standard inclusions: heavy-duty leaves, upgraded front upper control arms, camber locks, and reinforced rear axle bolts.
GCM upgrades available up to 8,050 kg.

Mercedes Sprinter 4x4

Upgrades available: 4430 kg and 4,650 kg
Suspension options: GVM Central Rear Leaf Springs Bilstein or Predator Shocks
Standard inclusions: heavy-duty leaves, ubolts, rear shock reinforcement brackets
State based (check your state for rulings) SSM upgrade coming soon