Hennessey MAMMOTH 6X6

Hennessey MAMMOTH 6x6

Colossal 6×6 Hennessey MAMMOTH Thunders Off Production Line


Hennessey starts build of its biggest and most exclusive six-wheel-drive truck
6.2-liter supercharged Hellcat V8 | 1,012 bhp | 969 lb-ft torque | 283-inches (719 cm) long


  • Mammoth 6×6 is biggest truck ever created in Hennessey’s 30-year history
  • Just 12 Hennessey Mammoth 1000 6×6 TRX trucks will be built each year, priced in excess of $449,950
  • Everything is bigger in Texas – New Hennessey 6×6 is terrifyingly imposing, montrously capable, and unthinkably fast

Sealy, Texas (April 19, 2022) – Hennessey, the Texas-based hypercar manufacturer and high-performance vehicle creator, has started building its biggest ever truck, the 1,012 bhp, 283-inch (719 cm) long Hennessey Mammoth 1000 6×6 TRX.


At almost seven feet high and 88 inches wide, the enormous 6×6 pickup truck dwarfs ordinary cars and trucks. It has the power to match its presence, with Hennessey’s engineers boosting performance of the stock Dodge Ram TRX engine by more than 300 horsepower to 1,012 bhp. The torque needed to propel the monster truck is enhanced similarly, totaling 969 lb-ft (1,314 Nm) after a 319 lb-ft (433 Nm) uplift by Hennessey.


Alongside performance upgrades, the new truck features a mountain of off-road kit from locking rear axles and Bilstein suspension, to 20-inch wheels clad in 37-inch off-road tires. The 6×6 Mammoth builds on the base Ram TRX adding a third axle, extending the truck’s length by more than four feet and creating a cavernous load-space.


John Hennessey, company founder and CEO: “Everything we do at Hennessey Performance is turned up to 11, but the Mammoth 1000 6×6 is definitely turned up to 12! Everything on the Mammoth 6×6 is bigger, badder, and more imposing – plus, it’s still super-fast, while being a total powerhouse off-road. It’s the undisputed king of the road.”


Priced from $449,950 – inclusive of the base Ram TRX – the four-door Mammoth 6×6 features uprated front and rear bumpers and a dazzling array of LED lights alongside a bespoke interior, which adds to the exclusivity of this special vehicle. Under the chest-height hood, the truck features a mighty 6.2-liter Hellcat V8 engine – a beast even in stock form. The Hennessey team builds on this foundation adding a high-flow 2.65L supercharger, fuel injectors and high-flow induction system alongside performance-boosting calibration.


Hennessey has a track record of success when it comes to gigantic and exclusive 6×6 trucks. The company has built and delivered more than 20 VelociRaptor 6×6 and Goliath 6×6 Silverado trucks to clients all around the world. This solid performance in the three-axle world has its foundation in the highest standards of customer satisfaction, with Hennessey priding itself on the quality of its vehicles and workmanship. Underscoring this dedication to quality and customer car, all Hennessey models are offered with extensive warranties. The Mammoth is no different, benefitting from comprehensive 2-year / 24,000-mile cover.


Available for global shipping, the new Hennessey Mammoth 1000 6×6 TRX can be ordered now through authorized Ram retailers or directly with Hennessey, by calling +1 979.885.1300 or visiting HennesseyPerformance.com.



Upgrades to Stock TRX

• Upgraded High-Flow Supercharger System
• Supercharger Front Drive Pulley Upgrade
• Supercharger Rear Drive Pulley Upgrade
• Crank Damper Pin Assembly Upgrade
• Upgraded Thermostat
• Heavy Duty Supercharger Belt
• Upgraded Spark Plugs
• High-Flow Fuel Injectors
• High-Flow Filtration System
• Crank Case Ventilation System
• HPE ECM Calibration Upgrade
• HPE TCM Calibration Upgrade
• All Necessary Gaskets & Fluids
• Chassis Dyno Testing
• Road Testing (Up To 400 Miles)


• Third Axle with Lockable Diff
• Extended Wheelbase and Bed
• Hennessey Embroidered Headrests
• Serial Number Plaques
• MAMMOTH Custom Front Bumper
• MAMMOTH Custom Rear Bumper
• LED Lights in Front Bumper
• 20-inch Hennessey 10-Spoke Wheels
• 37-inch Off-Road Tires
• Front Leveling Kit
• Upgraded Electronic Fold Out Steps
• Hennessey & MAMMOTH Exterior Badges
• Professional Installation
• Limited Edition – 12 per year
• 2-Year / 24,000 Mile Warranty

Package prices & contents subject to change.


2021 Ram TRX Truck + 1000 HP + 6-Wheel Drive = The Most Powerful Truck Ever Offered by Hennessey Performance

Sealy, Texas (September 1, 2020) — The team at Hennessey Performance Engineering (HPE) is planning to build the biggest and most powerful truck in the company’s 29-year history.  HPE will soon be building a 6X6 conversion of the 2021 Ram TRX truck.


Since 2017, the Hennessey team has built and delivered a total of 15 VelociRaptor 6X6 and GOLIATH 6X6 trucks to clients from around the world, making them some of the most exclusive vehicles ever produced by Hennessey Performance.  Hennessey will now be building Mammoth 6X6 Ram TRX trucks which will make it the most powerful and most exclusive truck ever offered by the company.


In addition to its all new 6-wheel drive and all new truck bed conversion, MAMMOTH 6X6 will have a fully upgraded off-road suspension, bespoke interior, upgraded front and rear bumpers with upgraded LED lights and more.

PLANNING AN UPGRADE? Get More Information About Hennessey Upgrades Available for Your Car!