300 Series Landcruiser

Project Overlander Build



TOTAL 300 series builds

The 300 Series offers the utlimate daily driver and weekend wagon tourer. These vehicles offer comfort and enough space for families.

While these perform fantastic as a daily driver, GVM upgrades are often essential for a touring spec rig. 

We trust JMACX's expertise in this field. JMACX GVM kits reflect real world and practical loading. Paying close attention to your axle load ratings is vital in these vehicles. Especially true if you are towing.

Treat your 300 Series with a capable and reliable GVM upgrade while not compromising on ride quality. From there we offer a range of accessory fitment options.


Setting the standards for GVM upgrades, coil conversions & 4x4 accessories across Australia.



The JMACX Toyota 79 Series Dual Cab leaf sprung GVM option ticks all the boxes. Track correction, higher axle load capacity, improved braking, vehicle stability. Although the leaf spring kits can’t compare to the ride comfort of a coil conversion they are a great option for those who want to stay with the leaf springs and need a true and usable 3900 GVM upgrade kit.



Looking for a Coil Conversion GVM Upgrade for your Toyota 79 Series Dual Cab? JMACX is the world’s number one trusted bolt in coil conversion manufacturer. The 3900 GVM upgrade is fully engineered to go above and beyond while maintaining comfort through all load types, constant or unloaded. This is the ultimate suspension upgrade for outback tourers, commercial vehicles and the weekend warrior. Unrivalled handling on and off road, allowing you to tow safely that big caravan or boat or head off into the bush with extra articulation. Nothing will stop you.


Australian Made - Purpose Built

See it in action - Alpha 2.5 Electric shocks

The 300 Series Alpha Shocks are built designed and tuned specifically for the 4×4 and GVM market. Whether your going off road, towing, 4 wheel driving or daily driving Alpha Shocks achieve optimum comfort and stability.

Alpha Electric Shocks allow you to adjust your shocks inside the cab.

JMACX Manual Adjustment Alpha Shocks are the standard adjustment of the Alpha Shock range while still maintaining the premium quality and performance. The manual adjustment Alpha Shocks provide up to 32 levels of adjustment depending on valving in the specifications of the shock. The JMACX Alpha Shocks are easy to install by a competent person and when the vehicle is stationary the adjustment is made easily by hand via turn of the adjuster cap.

300 Series Alpha Shocks Construction

Designed for the 4×4 market

Thousands of hours invested in R&D to provide a premium product with ultimate performance on and off road.

True 2.5″ bore shocks

True 2.5 inch (63.5mm) internal bore. Many claim to be 2.5″ yet they are often 2.5″ external body diameter.

Premium construction

CNC machined from steel body. Cerakote ceramic polymer finish / T6 billet alloy providing maximum corrosion protection.

4785 Psi rated hoses and fittings.


4140 hard chrome faced microcracked 22mm shaft polished for increased lubrication and longevity. Pressure active shaft seals.

Range of adjustment

Up to 3 times the force of adjustment than other aftermarket shocks allowing for greater variation of adjustment.

Piston and Valving

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.

Australian Made

Materials sourced and machine all within Australia. Support network nation wide no matter where you are.

Built in bump zone

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.

OEM Style bushes

Made from better quality materials while maintaining softness for ride quality, daubable enough to handle tough conditions for extended periods of time.

Sealed and greaseable

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.

300 Series

Contact Details

Pre or Post Rego

Year Model

Pre or Post Rego

Vehicle Status

Year Model

Vehicle Status