Pioneering the world’s first Bolt-In Coil Conversion
JMACX Offroad Solutions was founded by Jason McIntosh, driven by a desire to improve the suspension and drivability of his Toyota LandCruiser 76 Series. With extensive experience in coil spring vehicles, Jason set out to adapt coil spring suspension to the LandCruiser 70 Series range, pioneering a new level of performance and capability. It was apparent there was a lack of solutions for different suspension types and heavy duty components.
With his engineering background and deep industry knowledge, Jason invested thousands of hours into research and development, ultimately becoming the innovator, designer, and manufacturer of the world’s first bolt-in coil conversion for the 70 Series LandCruiser. While others have attempted alternative designs, the JMACX bolt-in coil conversion has set the benchmark delivering ultimate ride comfort, load-carrying capacity, and off-road performance on one of the most iconic 4×4 platforms in history.
The 5 link suspension system
The 5 link suspension system has been used by all major vehicle companies for many years now for example: The 5 link system has been tested and proven by all the major vehicle manufacturers as the ultimate geometry set-up for this type of vehicle.
The biggest advantage to the 5 link suspension set-up is its load carrying stability from the REAR PANHARD (the 5th link). This allows the rear differential to stay fixed and stabilised when cornering or with any side load on the vehicle. Without this rear panhard the differential would be able to move freely side to side from the chassis this would be suitable for light vehicles with low centre of gravity, rock crawling 4wd or a drag car that needs to only go in a straight line.
However when it comes to a heavy load carrying vehicle this would not be safe as it would not be able to support the side load on the suspension set-up hence where the 5 link came out on top. The 70 series is a load carrying vehicle with a high centre of gravity so the rear Panhard is a must to keep the suspension centred and assist in the stability and safety of the vehicle.
The 4 link suspension system
The 4 link Suspension system was another common geometry set-up that we looked at in the beginning however it had some major draw backs when it came to applying it on a 70 series land cruiser. Here is why Referencing straight from the BOSCH Automotive Engineering Handbook Version 7 – 9 on what is needed.
The basis of what is considered appropriate is based upon stability and other kinematic effects on the road handling of the vehicle.
4 link suspension system are acceptable in the correct circumstances and with the correct application of the engineering to ensure stability of the systems. The basic 4 link suspension system is designed for certain applications which are generally of high articulation applications (rock crawling off-road vehicles, high monster truck types, performance cars, hotrods or very rigid suspension applications).
The following are the critical design aspects for 4 link systems:
- Link lengths
- Instant centre (intersection point)
- Anti-squat geometry percentage
- Axle angle change
Note: Intersection Point is a very important aspect and provides the balance to the system.
With regards to running the 4 link setup on a 70 series Landcruiser, it is not possible to run triangulated lower control arms as the diff centre is not centralised meaning you will have to use straight lower control arms this setup is far from ideal for a road going vehicle. The system should ideally be a double triangulated setup with both upper and lower control arms at opposing angels to ensure that the system can be centred at all times.
With a straight lower control arm, the axle housing is able to laterally traverse under heavy load cornering, or indeed towing (ie: will try and maintain its original track and then dynamically release to follow the vehicle and as such causes a significant amount of instability and can be catastrophic if coupled with a incorrectly loaded trailer).
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JMACX Offroad Solutions was founded by Jason McIntosh, driven by a desire to improve the suspension and drivability of his Toyota LandCruiser 76 Series. With extensive experience in coil spring vehicles, Jason set out to adapt coil spring suspension to the LandCruiser 70 Series range, pioneering a new level of performance and capability. It was apparent there was a lperformance on one of the most iconic 4×4 platforms in history.
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JMACX Offroad Solutions was founded by Jason McIntosh, driven by a desire to improve the suspension and drivability of his Toyota LandCruiser 76 Series. With extensive experience in coil spring vehicles, Jason set out to adapt coil spring suspension to the LandCruiser 70 Series range, pioneering a new level of performance and capability. It was apparent there was a lperformance on one of the most iconic 4×4 platforms in history.
03.
JMACX Offroad Solutions was founded by Jason McIntosh, driven by a desire to improve the suspension and drivability of his Toyota LandCruiser 76 Series. With extensive experience in coil spring vehicles, Jason set out to adapt coil spring suspension to the LandCruiser 70 Series range, pioneering a new level of performance and capability. It was apparent there was a lperformance on one of the most iconic 4×4 platforms in history.
From the family garage to the forefront of 4WD engineering
JMACX was founded with a singular vision, to revolutionise the stability and load capacity of Australia’s most iconic and cherished vehicle series, the 70 Series Landcruiser. From our humble beginnings, we have grown into a leading force in Australian manufacturing, producing premium vehicle components that not only meet, but exceed, industry standards.
JMACX continues to lead the way, shaping the future of off-road upgrades and creating a benchmark for others to follow. It’s what we do.
2015
Company Founder Jason McIntosh designs, engineers & patents the first coil conversion.
First ever appearance of the worlds first coil conversion at the brisbane 4×4 show
2016
JMACX Installers & facilities come onboard.
JMACX designs the first 6×6 system for JMACX & Patriot Campers.
3000+
5000+
40+
Innovation & growth is at the heart of what we do.
For over a decade, we’ve been engineering and crafting accessories built to perform — whether on the open road or deep off the beaten track. We don’t just talk the talk, we live it every day.
The question we always come back to is simple: “What’s best for the customer?” That mindset drives every part of what we do, from product design and engineering to the service you receive. At JMACX, we’re constantly pushing boundaries, evolving our range, and setting new standards in off-road solutions.
Built for what’s next
From humble beginnings to engineering Australia’s toughest vehicle upgrades, JMACX has always been about strength, innovation, and pushing limits.
But we’re only getting started. The road ahead holds bigger builds, smarter solutions, and adventures that will take off-road performance to the next level.
To every customer, mate, and supporter who’s been part of the JMACX journey — thank you. The tracks, trails, and challenges ahead are calling, and we’re ready to tackle them with you.
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JMACX was originally founded on a dedicated desire to improve the ride, stability & load capacity of Australia’s most loved series of vehicles.
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JMACX was originally founded on a dedicated desire to improve the ride, stability & load capacity of Australia’s most loved series of vehicles
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JMACX was originally founded on a dedicated desire to improve the ride, stability & load capacity of Australia’s most loved series of vehicles.
