GVM Upgrades

Take your adventure further and carry more with JMACX GVM Upgrades at Boss Aluminium.

Boss Aluminium is proud to be an Authorised JMACX GVM Dealer, offering vehicle performance and capability upgrades tailored for Australian conditions. Designed for serious adventurers and hard-working professionals, JMACX GVM upgrades enhance stability, increase towing capacity, and improve handling both on and off-road.

Whether navigating rugged Australian trails, towing heavy loads, or seeking a smoother ride, these GVM upgrades provide the reliability and performance needed to meet any challenge. Trust Boss Aluminium for expertly installed GVM upgrade solutions, ensuring your vehicle is ready for any adventure or work environment.
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Surpassing the industry standard for the best driving performance and safety. 

JMACX kits are engineered to beyond minimum requirements, delivering enhanced safety and driving performance for your vehicle. With high-quality components and advanced engineering, JMACX gives you peace of mind when navigating challenges or towing heavy loads.

Invest in a solution that prioritizes safety and elevates your driving experience, allowing you to tackle any adventure with confidence. 

Vehicle Types

Toyota LandCruiser 79 8 Cylinder (Dual and Single Cab)
Toyota LandCruiser 79 4 Cylinder (Dual and Single Cab)
Toyota LandCruiser 76 4 or 8 Cylinder (Wagon)
Toyota LandCruiser 78 4 or 8 Cylinder (Troop Carrier)
Toyota Landcruiser 200/300 Series
Ford Ranger Next-Gen
Dodge RAM 1500 DT / DS
Toyota LandCruiser 79 8 Cylinder (Dual and Single Cab) 

The JMACX Toyota 79 Series Single/Dual Cab leaf-sprung GVM upgrade is the perfect solution for those seeking a cost-effective, reliable option in both 3900 and 4200 GVM Variants. This upgrade offers track correction, increased axle load capacity, enhanced braking, and improved stability, all while maintaining the durability of the leaf springs. While it may not match the comfort of a coil conversion, this kit is ideal for those who want to stick with leaf springs and need a practical GVM upgrade. It's the ultimate balance of performance and affordability for serious work or off-road adventures.

  • JMACX GVM Leaf Kit
  • SSM Approval
  • Choice of JMACX Pro Series or Alpha Shocks (with either manual or electric adjustment)
  • JMACX Track Correction Leaf Diff
  • JMACX Heave Duty 300m Chrome-Moly Full Floating Axle Kit
  • 70 Series Front Coils
  • Front Swaybar Blocks
  • Caster Correction Bushings
  • GVM weight rated wheels and tyres

Looking for the ultimate coil conversion GVM upgrade for the Toyota 79 Series? JMACX, the world’s leading coil conversion manufacturer, offers a 3900kg or 4200kg GVM upgrade engineered for superior performance. This upgrade provides unmatched comfort, whether fully loaded or driving light, making it the top choice for outback tourers, commercial vehicles, and weekend adventurers. With improved handling on and off-road, it allows for safe towing of caravans or boats while offering extra articulation for bush tracks. Wherever the journey leads, this upgrade ensures nothing will hold you back.

  • Fully Welded Bolt on Structural Cradle and Side Plates
  • JMACX Heavy Duty Adjustable Control Arms
  • JMACX Track Correction Heavy Duty Fabricated Diff Housing
  • JMACX Heavy Duty 300m Chromoly Floating Axle Kit
  • Heavy Duty Adjustable Rear Sway Bar
  • Choice of JMACX Pro Series or Alpha Shocks (with either manual or electric adjustment)
  • High Pressure Airbag Man In Coil Airbags
  • JMACX Brake Booster Upgrade
  • 70 Series Front Coils
  • Coil Conversion Rear Coils
  • Torqit 3.5inch DPF Back Exhaust
  • GVM Weight Rated Wheels and Tyres
  • Upgraded clutch (for 4200 kits only)

The JMACX 79 Series Dual Cab 4495kg Super Chassis GVM Upgrade takes the Landcruiser to a whole new level. With a 300mm chassis extension, this upgrade offers the highest GVM available on a light vehicle driver's license, plus a towing capacity boosted to 4000kg. The addition of coil suspension delivers a smooth, comfortable ride, whether you're towing heavy loads or hitting rugged trails. This is the ultimate setup for those looking to push their 79 Series to the limit with unbeatable performance and capability.

  • 79 Series Super Chassis with 300mm Extension and Built in Rear Winch Cradle
  • Adjustable Upper and Lower Control Arms
  • JMACX Track Correction Heavy Duty Fabricated Diff Housing
  • JMACX Heavy Duty 300m Chromoly Floating Axle Kit
  • JMACX Full Braided Brake Line Kit
  • Heavy Duty Adjustable Rear Sway Bar
  • Choice of JMACX Pro Series or Alpha Shocks (with either manual or electric adjustment)
  • JMACX Billet Front Sway Bar Blocks
  • 70 Series Front Coils
  • JMACX Coil Conversion Rear Coils (Standard Silver)
  • Marks Hydro Brake Booster Upgrade - ABS (ABS)
  • Torqit 3.5Inch DPF Back Exhaust
  • JMACX Elite H-Beam CNC Billet Radius Arms
  • JMACX Heavy Duty Adjustable Front Panhard
  • Brown Davis 185L Fuel Tank
  • Choice of JMACX Pro Series or Alpha Shocks (with either manual or electric adjustment)
  • Upgraded Clutch
  • GVM Weight Rated Wheels and Tyres

The JMACX 6-Wheel Drive Triple Locked LC79 Super Chassis Kit elevates the Landcruiser to unparalleled capability. Available in 4495kg, 5300kg, and now 5800kg GVM options, this kit gives you the highest GVM on a standard or light rigid vehicle license, with towing capacities of up to 4500kg. The coil suspension ensures a smooth, comfortable ride, even with the extra load and wheels, while triple locking differentials provide unbeatable off-road traction. Whether you're looking for heavy-duty touring or serious off-road adventures, this upgrade takes your Landcruiser to a whole new level of performance.

  • JMACX 6x6 Super Chassis Kit
  • 79 Series Super Chassis with 100mm Extension and Built in Rear Winch Cradle
  • Adjustable Upper and Lower Control Arms
  • JMACX Track Correction Heavy Duty Fabricated Diff Housing
  • JMACX Heavy Duty 300m Chrom-Moly Floating Axle Kit
  • JMACX Full Braided Brake Line Kit
  • Heavy Duty Adjustable Rear Sway Bar
  • Choice of JMACX Pro Series or Alpha Shocks (with either manual or electric adjustment)
  • JMACX Billet Front Sway Bar Blocks
  • 70 Series Front Coils
  • JMACX Coil Conversion Rear Coils (Standard Silver)
  • Marks Hydro Brake Booster Upgrade - ABS (ABS)
  • Torqit 3.5Inch Single Cab DPF Back Exhaust
  • JMACX Elite H-Beam CNC Billet Radius Arms
  • JMACX Heavy Duty Adjustable Front Panhard
  • Brown Davis 185L Fuel Tank
  • Choice of JMACX Pro Series or Alpha Shocks (with either manual or electric adjustment)
  • Upgraded Clutch
  • GVM Weight Rated Wheels and Tyres
Toyota LandCruiser 79 4 Cylinder (Dual and Single Cab)

The JMACX Toyota 79 Series Single/Dual Cab leaf-sprung GVM upgrade is the perfect solution for those seeking a cost-effective, reliable option in both 3900 and 4200 GVM Variants. This upgrade offers track correction, increased axle load capacity, enhanced braking, and improved stability, all while maintaining the durability of the leaf springs. While it may not match the comfort of a coil conversion, this kit is ideal for those who want to stick with leaf springs and need a practical GVM upgrade. It's the ultimate balance of performance and affordability for serious work or off-road adventures.

  • JMACX GVM Leaf Kit
  • SSM Approval
  • Choice of JMACX Pro Series or Alpha Shocks (with either manual or electric adjustment)
  • JMACX Track Correction Leaf Diff
  • JMACX Heave Duty 300m Chrome-Moly Full Floating Axle Kit
  • 70 Series Front Coils
  • Front Swaybar Blocks
  • Caster Correction Bushings
  • GVM weight rated wheels and tyres

Looking for the ultimate coil conversion GVM upgrade for the Toyota 79 Series? JMACX, the world’s leading coil conversion manufacturer, offers a 3900kg or 4200kg GVM upgrade engineered for superior performance. This upgrade provides unmatched comfort, whether fully loaded or driving light, making it the top choice for outback tourers, commercial vehicles, and weekend adventurers. With improved handling on and off-road, it allows for safe towing of caravans or boats while offering extra articulation for bush tracks. Wherever the journey leads, this upgrade ensures nothing will hold you back.

  • Fully Welded Bolt on Structural Cradle and Side Plates
  • JMACX Heavy Duty Adjustable Control Arms
  • JMACX Track Correction Heavy Duty Fabricated Diff Housing
  • JMACX Heavy Duty 300m Chromoly Floating Axle Kit
  • Heavy Duty Adjustable Rear Sway Bar
  • Choice of JMACX Pro Series or Alpha Shocks (with either manual or electric adjustment)
  • High Pressure Airbag Man In Coil Airbags
  • JMACX VDJ Brake Booster Upgrade
  • 70 Series Front Coils
  • Coil Conversion Rear Coils
  • Torqit 3.5inch DPF Back Exhaust
  • GVM Weight Rated Wheels and Tyres

Looking to take your LandCruiser 79 Series Dual Cab to the next level? The JMACX 4495 GVM Coil Conversion Upgrade is the ultimate solution. Designed for the new 4-cylinder Dual Cab, this upgrade is fully engineered to deliver unmatched performance, comfort, and capability—whether you’re touring the outback, towing heavy loads, or tackling tough trails. Vehicle BTC remains as factory.

  • Fully Welded Bolt In Structural Cradle And Side Plates
  • JMACX Heavy Duty Adjustable Lower Control Arms
  • JMACX Heavy Duty Adjustable Upper Control Arms
  • JMACX Heavy Duty Adjustable Rear Panhard
  • JMACX Track Correction Upgraded Heavy Duty Fabricated Coil Diff Housing 3000kg Rated (Under Rated At 2850kg For This Kit)
  • JMACX Heavy Duty 300m Chrome-Moly Full Floating Axle Kit
  • JMACX Brake Booster
  • JMACX Full Braided Brake Line Kit
  • JMACX Heavy Duty Adjustable Rear Sway Bar And Link Kit
  • High Pressure Airbag Man In Coil Airbags
  • JMACX Billet Front Sway Bar Blocks
  • JMACX SSM Approval (Australian National Approval)
  • 4 Inch 70 Series Front Coils
  • 4 Inch JMACX Coil Conversion Rear Coils
  • JMACX Elite H-Beam CNC Billet Radius Arms
  • JMACX Heavy Duty Adjustable Front Panhard
  • Torqit 3.5 Inch DPF Back Exhaust
  • Torqit 3.5Inch 300mm Extension
Toyota LandCruiser 76 4 or 8 Cylinder (Wagon)

Coil Conversion (3900)

Looking for a Coil Conversion GVM Upgrade for your Toyota 76 Series Wagon? JMACX, the world’s leading coil conversion manufacturer, offers the 3900kg GVM upgrade, fully engineered to deliver outstanding performance. Whether loaded or unloaded, this upgrade maintains superior comfort and control, making it perfect for outback tourers, commercial use, or weekend getaways. Experience unbeatable handling both on and off-road, with enhanced articulation for tackling tough terrain. Safely tow your caravan or boat and head off the beaten track with confidence—nothing will stand in your way.

  • Fully Welded Bolt On Structural Cradle and Side Plates
  • JMACX Heavy Duty Adjustable Control Arms
  • JMACX Track Correction Heavy Duty Fabricated Diff Housing
  • JMACX Heavy Duty 300m Chromoly Floating Axle Kit
  • Heavy Duty Adjustable Rear Sway Bar
  • Choice of JMACX Pro Series or Alpha Shocks (with either manual or electric adjustment)
  • High Pressure Airbag Man Coil Airbags
  • JMACX VDJ Brake Booster Upgrade
  • 70 Series Front Coils
  • Coil Conversion Rear Coils
  • Torqit 3.5inch Single Cab DPF Back Exhaust
  • GVM Weight Rated Wheels and Tyres
Toyota LandCruiser 78 4 or 8 Cylinder (Troop Carrier)

Coil Conversion (3900 or 4200)

Looking to upgrade your Toyota 78 Series Troop Carrier with a Coil Conversion GVM? JMACX, the leading name in coil conversions, offers robust options with 3900kg and 4200kg GVM variants. Designed for exceptional performance, these upgrades ensure superior comfort and control whether you're loaded up for a trip or cruising empty. Ideal for outback explorers, commercial operations, or weekend warriors, you'll enjoy enhanced handling both on and off-road, along with improved articulation for navigating rugged landscapes. Tow your caravan or boat with confidence and venture into the wild—nothing can hold you back!

  • Fully Welded Bolt On Structural Cradle and Side Plates
  • JMACX Heavy Duty Adjustable Control Arms
  • JMACX Track Correction Heavy Duty Fabricated Diff Housing
  • JMACX Heavy Duty 300m Chrom-Moly Floating Axle Kit
  • Heavy Duty Adjustable Rear Sway Bar
  • Choice of JMACX Pro Series or Alpha Shocks (with either manual or electric adjustment)
  • High Pressure Airbag Man In Coil Airbags
  • JMACX VDJ Brake Booster Upgrade
  • 70 Series Front Coils
  • Coil Conversion Rear Coils
  • Torqit 3.5inch DPF Back Exhaust
  • GVM Weight Rated Wheels and Tyres
  • Upgraded Clutch (for 4200 V8 kits only)
Toyota Landcruiser 200/300 Series

Upgrade your Toyota Landcruiser 300 Series with our GVM solutions, designed to elevate your adventures. Choose between the 3800kg or 4200kg GVM upgrades, each featuring premium JMACX suspension, increased ground clearance with a 2- or 3-inch lift, and the unmatched ride of Alpha Shocks. Whether you’re towing your caravan, hauling your boat, or exploring off-road trails, these upgrades provide unbeatable handling and confidence on any terrain.

  • Upgraded Diff Housing
  • JMACX Alpha Shocks
  • Rear Coils
  • Airbag Man Air Bags
  • Rear Lower Trailing Arms
  • Front Upper Control Arms
  • Indicator Kit
  • Reverse Light Kit
  • Engineering
Ford Ranger
Ranger

Looking to boost your Ford Ranger Next Gen's performance? Our 3600kg GVM upgrade has you sorted. With premium suspension and a 2- or 3-inch lift, you’ll get extra ground clearance and the smooth ride of Alpha Shocks. Whether you’re towing the caravan for a weekend adventure, taking the boat out, or hitting the bush for some off-road action, this upgrade gives you the rugged handling and reliability you need to conquer any terrain. Get more out of your Ranger and take on anything that comes your way.

  • JMACX Alpha Shocks (Choice of Electric or Manual Adjustment)
  • Next-Gen Flare and Mudflap Kit
  • Ironman Front Upper Control Arms
  • JMACX GVM Leaf Packs (Choice of Constant or Variable Load)
  • Engineering
  • Leaf Bush Kit
  • U-Bolt Kit
Dodge RAM 1500 DT / DS

The Dodge Ram 1500 DS is gaining traction among heavy-duty touring enthusiasts, and we’ve got the upgrade to take it even further. Engineered for serious hauling, our GVM upgrade boosts the Australian market GVM to 4200kg with a full rear differential, axle, and brake overhaul, plus premium JMACX suspension. This upgrade gives your Ram the extra stability and smooth ride you need, whether you’re loaded up for a big adventure or just hitting the road unloaded. Built for touring, this upgrade lets you take on any challenge in true American style, while keeping performance top-notch on Australian terrain.

**1500 DT Limited model is converted from Air Ride to Coil Suspension

  • JMACX Alpha Shocks (Choice of Manual or Electric Adjustment)
  • Reinforced Diff Housing (Choice of Air Locker Upgrade and 9 Inch Fabricated Diff Upgrade)
  • 4200 GVM Rear Coils
  • High Pressure Airbag Man Coil Airbags
  • Upgraded Upper Control Arms
  • Brake Upgrade to 8 Pot Callipers, Sports Pads and Slotted Rotors

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