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.


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