GVM Upgrades
Designed for load carrying touring/work and service vehicles when you need both stability & safety.
JMACX is the innovator and industry leader in coil conversions/6×6/ 4wd suspension systems. GVM upgrades for the ultimate vehicle. Giving you the strongest coil conversion on the market with full engineering and road legal in Australia for up to 4inches of lift and 35inch tires. With the GVM upgrade this is the ultimate suspension upgrade for outback tourers, commercial vehicles and the weekend warrior. Tested and proven in some of the world’s harshest conditions.
GVM Upgrades
Designed for touring, load carrying vehicles when you need both stability & safety.
Jmacx is the innovator and industry leader in coil conversions / GVM upgrades for the ultimate Landcruiser. Giving you the strongest coil conversion on the market with full engineering and road legal in Australia for up to 4inches of lift and 35inch tires. With the GVM upgrade this is the ultimate suspension upgrade for outback tourers, commercial vehicles and the weekend warrior. Tested and proven in some of the world’s harshest conditions.
GVM Upgrades
Designed for touring, load carrying vehicles when you need both stability & safety.
Jmacx is the innovator and industry leader in coil conversions / GVM upgrades for the ultimate Landcruiser. Giving you the strongest coil conversion on the market with full engineering and road legal in Australia for up to 4inches of lift and 35inch tires. With the GVM upgrade this is the ultimate suspension upgrade for outback tourers, commercial vehicles and the weekend warrior. Tested and proven in some of the world’s harshest conditions.
4x4 Suspension Kits
For our 4×4 suspension kits have a look through the 3900 – 4495 GVM upgrade selections below.
6x6 Suspension Kits
For our 6×6 suspension conversions have a look through the 4495kg GVM to 6000kg GVM upgrade selections below.
Don’t get caught short. GVM’S to suit the real world, maximum loading capabilities.
Choose your vehicle to display the available GVM upgrades.
What is
Gross Vehicle Mass
Your vehicle’s Gross Vehicle Mass (GVM) is the maximum weight your vehicle can carry when fully loaded. Absolutely everything on your vehicle add to the the Gross Vehicle Mass and needs to be accounted for. This includes the vehicle itself, any load you’re carrying, fuel, accessories and also any additional tow ball load from a trailer, camper or boat.
It’s important to understand that your vehicle GVM is not only a safety requirement, it’s a legal requirement as well. You’ll also notice that your vehicle won’t perform as well when driving close to the manufacturer’s factory GVM specification.
GVM Upgrade & Coil Conversion Frequently Asked Questions
Does the Kit Contain Parts that are Custom and Maybe Difficult to find if in the middle of Nowhere?
- Our diffs maintain all factory brakes, hubs, bearings, seals, diff lockers etc.
- Our Coil Kit uses factory length Landcruiser control arms, Panhard.
- Most parts maintain OEM Toyota bushes, so parts can be easily accessible anywhere in the world.
How strong are the upgraded axles?
- Our diff housings are full fabricated units that exceed the strength of the factory original unit. JMACX Axles are the strongest production manufactured axle for Toyota Landcruiser available. 100% Australian made and designed.
How Long will Jmacx need my vehicle for?
- Coil conversion – 7-14 working days.
- Suspension GVM kit – 1-3 working days.
- 6×6 conversion – 4-6 weeks.
- Chassis extension – 2 week.
* Depending on what accessories are being fitted to the vehicle. Approximate time lines.
Does the new wide track diff correct the rear vehicle track?
- Yes. Why? To increase the stability of the vehicle.
- What’s the width difference from the front to the rear? 100mm.
- Note: wheel spacers and large offset wheels over 25mm are illegal in all States Australia wide.
Can i have a Custom Colour?
Yes, automatically our kits are a standard black. But let us know and we can give you a custom colour to suit you!
- We often see customers selecting a colour that represents their business
What size wheel can I run on a GVM upgrade?
Regardless of which company you get your GVM upgrade done at, you can only run the wheel size stated on your wheel placard that has been supplied to you by your GVM provider. As the GVM has allowed you to carry more load and has been tested on the specific tyre size stated. The 50mm greater tyre limitation that applies to standard vehicles (VSB14) does not apply to GVM upgrades in all States of Australia. Ask your GVM provider what tyre size is stated on their GVM upgrade.
NOTE: Running larger size tyres than your GVM states may void your insurance in the case of an accident. Due to not meeting the braking requirement testing.
What does an upgraded differential allow me to legally increase my axle load rating to?
Adding an upgraded diff housing with a higher rating eg. 3,000kg does not automatically increase your axle load capacity to 3,000kg. The diff housing upgrade is only one piece of the equation. To achieve an increase axle capacity requires not only axle load but also springs and shocks engineered to carry and control the weight. Load rated wheels and tyres are also required.
Axel load capacity is fixed by the GVM provider. Adding a higher rated differential will not give you an increased usable axle load. If the GVM states a lesser axle load.
Why do I need a brake upgrade for some GVM’s and not others?
Brake upgrades are often required either due to the size of the GVM upgrade and or the fact that larger tyres are permitted on one GVM over another.
Are JMACX GVM’s upgradeable?
Yes, some of JMACX’s GVM have the provision to upgrade with additional parts which can future proof your vehicle. For more information contact the JMACX team.
After my GVM is fitted, can I change some of the components of the GVM?
No. Any component that is changed or replaced must be from the GVM provider and must be the part that is specified under the engineering for that GVM. If any part is changed or removed your GVM will be void, your vehicle will technically be illegal. Therefore in the
case of an accident your insurance can be voided.
NOTE: GVM upgrades are approved by the Federal and State Government, backed by stringent testing and requirements to allow you to carry more load in your vehicle and must be adhered to for legal compliance.
Will my GVM reduce the articulation in my vehicle?
No, however more weight will be required to make the suspension flex. It is not possible to have massive flex on a load carrying vehicle as this will compromise the vehicle’s stability
and safety when loaded.
FACT: Diff lockers will out perform flex when it comes to off road capability.
What is the difference between State and Federal approval?
Federal approval is done prior to first registration. This vehicle is then registered as a vehicle manufactured by the GVM provider ie. no longer a Toyota LandCruiser. These vehicles must be provided at first registration with no other modifications other than the specific approved GVM kit. This vehicle is compliant in all States land does not require any further engineering unless modified outside it’s original design.
State approval is done post registration in your applicable State. Even though an SSM approval can be applied to a post register car there may be some restrictions due to State legislation. For example lift height, tyre size, GCM and BTC increases. Recommended to check with your State legislation for compliance. All GVM upgrades post registration only apply to the State your vehicle is registered in. If you try to register the vehicle in an other state you will be required to re engineered in that State.
Can I lift my vehicle higher after my GVM is complete?
No. The vehicle must remain as per the GVM certification due to the engineering testing. Doing this will void your insurance in the event of an accident.
Should I just buy the biggest GVM available to ensure I have enough carrying capacity?
No, not in all applications. For example all leaf GVM suspension kits will have a leaf spring designed to carry a minimum weight requirement (your GVM provider will supply a label stating minimum weight requirement) However using a coil spring suspension will differ, allowing you to have a larger range of carrying capacity and comfort.
So it’s important to calculate the potential weights of your vehicle and whether your load will be constant or it will be variable. And if variable how big is this variance in weight change. As this may affect your choice of GVM suspension type.
Does my GVM have Australia wide support?
Yes, JMACX have over 30 facilities Australia wide who specialise in suspension.
Will It Affect my Insurance?
No, but it is up to each individual to check with their insurer. (Generally Insures only require the vehicle to be Legal.)
