Industry Leading GVM Upgrades
Setting the standards for GVM upgrades, coil conversions & 4x4 accessories across Australia.
JMACX was originally founded on a dedicated desire to improve the ride, stability & load capacity of Australia’s most loved series of vehicles. Leading the way in Australian manufacturing of high quality vehicle components.
Our customers benefit from a passionate team that delivers unsurpassed build quality and customer service. JMACX are the innovators of the 70 series coil conversion and chassis extensions. With a patent design (IP2020202596) JMACX has always been at the forefront of coil conversions for others to follow.
Available JMACX GVM Upgrades

Landcruiser 300 Series GVM Upgrade 3800 Kg Wagon



VDJ 79 Series 3900 Kg Coil Conversion

VDJ 79 Series 4200 Kg Coil Conversion

VDJ 79 Series 4495 Kg SUPER CHASSIS GVM Upgrade

VDJ 78 Series 3900Kg Coil Conversion

VDJ 78 Series 4200Kg Coil Conversion

VDJ 76 Series Coil Conversion GVM Upgrade 3900Kg Wagon

1GD 78 Series 3900Kg Coil Conversion

1GD 78 Series 4200Kg Coil Conversion

1GD 76 Series Coil Conversion GVM Upgrade 3900Kg Wagon

1GD 79 Series 3900Kg Coil Conversion

1GD 79 Series 4200Kg Coil Conversion

1GD 79 Series 4495kg SUPER CHASSIS GVM Upgrade

1GD 79 Series 4200 Kg LEAF GVM

1GD 79 Series 3900 Kg LEAF GVM

Ram 1500 DS GVM Upgrade 4200 Kg

Ram 1500 DT GVM Upgrade 4200 Kg

Ram 1500 DT Limited GVM Upgrade 4200 Kg

Ranger Next Gen GVM Upgrade 3600 Kg
ALPHA SERIES SHOCKS
Australian Made - Purpose Built
70 Series Alpha Shocks Construction
Thousands of hours invested in R&D to provide a premium product with ultimate performance on and off road.
True 2.5 inch (63.5mm) internal bore. Many claim to be 2.5″ yet they are often 2.5″ external body diameter.
4140 hard chrome faced microcracked 22mm shaft polished for increased lubrication and longevity. Pressure active shaft seals.
Up to 3 times the force of adjustment than other aftermarket shocks allowing for greater variation of adjustment.
CNC machined piston performance port configuration. Variable rate shim stack enhancing vehicle damping performance.
Unlike competitors our spherical bearings in Alpha struts are sealed and greaseable preventing premature failure.
Materials sourced and machined all within Australia. Support network nation wide no matter where you are.
This protects your vehicle from damage and provides more control as the shock approaches full compression, increasing damping force to combat suspension bottoming during high-velocity suspension movements.
Made from better quality materials while maintaining softness for ride quality, daubable enough to handle tough conditions for extended periods of time.
Unlike our competitors, the spherical bearings in Alpha struts are sealed and greaseable protecting from the elements and preventing premature failure.
Shocks can be revalved (finely tuned), serviced and fully rebuilt to your requirements as every car weighted different.
