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JMACX Coil Conversion

The Toyota 70 Series LandCruiser is widely regarded as the most reliable and capable four-wheel-drive available in Australia. While its rear, leaf pack sprung, solid axle suspension has proven rugged durability, Boss Aluminium offers a more modern, coil conversion package.

With a JMACX coil conversion, 70 series LandCruisers become a completely different beast. The 5 link solid axle system has many advantages including:

  • Increased off road capability
  • Elevated occupant comfort
  • Improved on and off road handling
  • Increased towing stability
  • Increased off-road articulation
  • Over-engineered driveline and suspension components
  • Wheel track correction (includes corrected fabricated diff housing and axles to suit)


70 series LandCruisers from 2007 onwards have been delivered from the factory with a rear wheel track 100mm narrower than the front. The JMACX coil conversion includes a fabricated diff housing and chromoly axles that matches the front axle track. This improves stability on sealed roads, soft surfaces and in dry wheel ruts.

JMACX coil conversions were initially developed by JMACX Off Road Solutions in Queensland. Since the initial product release, Boss Aluminium has played an integral role in its continual development and evolvement. Finite Element Analysis overseen by AEV has also paved the way to register the kit for Second Stage Manufacturing (SSM), which includes complete ADR compliance.

Second Stage Manufacturing allows the kit to be installed pre-registration and equipped with an SSM modification plate, a vehicle is legal to register in any state without further approval.

JMACX Coil Conversion Second Stage Manufacturing approval number:

The kit is legally capable of up to 4 inches of lift above standard height, and can be engineered with the use of 35 inch tyres. Due to the nature of the system’s second stage manufacturing registration, the engineering certification of each kit installation does not require a swerve test.

The kit is designed to distribute spring load evenly through the chassis, this reinforcement means that airbag coil helpers can be utilised without risk of bending or cracking the vehicle’s chassis. It also features heavy duty driveline componentry such as chromoly axles. Due to these design features, vehicles with the kit installed are capable of GVM upgrades to 3900kg and GCM upgrades to 7400kg.

All solutions offered by Boss Aluminium are completely customisable to individual requirements and delivered with a Lifetime Guarantee on workmanship and materials.

Standard Features

  • Conversion frame incl. chassis reinforcement, coil towers, control arm mounts and panhard mount
  • Lower control arm mounts
  • Adjustable control arms & panhard
  • Control arm mounts or boss (depending on model)
  • Heavy-duty swaybar and linkage
  • Ironman foam cell pros (2.5in⌀)
  • Coil retainers
  • Bump stops
  • Heavy duty fabricated diff housing (With track to match front axles)
  • Chromoly axles
  • Brake lines
  • ADR compliant in all states
  • Available with up to 4 inches of lift
  • Portal axle compatible
  • Individually fitted and engineer certified at our Bayswater facility
  • Compatible with Boss’ range of trays and canopies

Additional options

  • Kings remote-reservoir shocks
  • Coil-helper airbags
  • Portal axles
  • Boss long-range fuel tank co-developed with Brown Davis
  • Boss auxiliary fuel tank co-developed with Brown Davis
  • Stainless steel 3in exhaust
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Explore the Possibilities

Wherever you are in Australia, Boss Aluminium can help you get more from your work or leisure vehicle. Contact us today to discuss your needs.