Welcome to Jmacx

JMACX is the innovator and industry leader when it comes to coil conversions and GVM upgrades for the ultimate Landcruiser. Giving you the strongest coil conversion on the market with unrivalled stability and handling.

GVM upgrades, with the highest axle load rating in Australia, allowing you to practically load and use the full potential of the GVM upgrade in your vehicle.

With hundreds of conversions done in commercial, military, outback tourers and work vehicles, combined with millions of kilometres driven in some of the worlds harshest conditions, this patented kit has proven itself to go above and beyond. No wonder it is the worlds number one trusted coil conversion and Australia’s only bolt in conversion.


click on the tabs below to find a package that best suits your needs .

DS 1500 DODGE RAM 4200 GVM

The Dodge Ram 1500 pick up truck is becoming a popular choice. Engineered for the American
market, the RAM DS 1500 GVM has already had the 10% GVM increase to maximum when it
lands in Australia. ( 3100-3400Kg) At factory specs the maximum axel load capacity only leaves
approximately 90kg. With the factory GVM exhausted JMACX offers a GVM solution by
upgrading the rear axels, brakes and suspension.
A brake upgrade is required due to the vehicle being redesigned to carry more load. Under
testing the current braking system is inadequate for a GVM upgrade.
Extra engineering is included in the Axel upgrade. The JMACX GVM kit not only strengthens the
diff but also the rear wheel bearings are changed to suit the increase in load carry capacity.
Premium suspension is included in the 4200 GVM upgrade which will result in an ultimate ride
both loaded or unloaded, with extra stability. The suspension solution provides 2 inches in the
rear and levelling in the front. Want to know how much payload you can carry? click here to calculate your weight