Outstanding Quality

Unparalleled Design

Proven Over Millions of KMs

Unparalleled Design

JMACX really is the industry leader in GVM upgrades, coil conversions, 6×6 conversions & 4wd suspension systems. Our customers receive the strongest coil conversion on the market backed by full engineering & certification.

Passion For Quality

You’ll get the benefit of our expertise with thousands of completed coil conversions & suspension systems fitted in commercial, outback tourers and work vehicles.
Our experience combined with millions of kilometres driven in some of the worlds harshest conditions shows that our patented GVM kit has proven itself to go above and beyond.


Coil Conversion GVM Upgrades

3900 kg 4200 kg

3900 kg 4200 kg

RAM 1500 GVM Upgrades

4200 kg

200 Series GVM Upgrades

3800 kg 4200 kg

300 Series GVM Upgrades

3800 kg 4200 kg 

70 Series Coil Conversions

Looking for a Coil Conversion GVM Upgrade for your Toyota 79 Series Dual Cab? JMACX is the world’s number one trusted bolt in coil conversion manufacturer. The 3900 GVM upgrade is fully engineered to go above and beyond while maintaining comfort through all load types, constant or unloaded. This is the ultimate suspension upgrade for outback tourers, commercial vehicles and the weekend warrior. Unrivalled handling on and off road, allowing you to tow safely that big caravan or boat or head off into the bush with extra articulation. Nothing will stop you.

300 Series GVM Upgrades

Looking for a GVM upgrade on your Toyota Landcruiser 300 series? We have you covered. Including premium suspension increased ground clearance with 2 or 3 inch lift. Nothing rides like the Alpha Shocks included in the 300 Series GVM upgrade along with other premium suspension parts. This kit is well suited for you with unrivalled handling on and off road, allowing you to tow safely that big caravan or boat to the destination or head off into the bush. Nothing will stop you.

See it in action

Lets Build your dream 

'Project Overlander' With JMacx