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Colossal 6×6 Hennessey Mammoth Thunders Off Production Line


May 12, 2022

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, monstrously 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. 

Specifications: HENNESSEY MAMMOTH 1000 6×6 TRX 

MAMMOTH 1000 6×6 TRX






Upgraded High-Flow Supercharger System

Third Axle with Lockable Diff

Supercharger Front Drive Pulley Upgrade

Extended Wheelbase and Bed

Supercharger Rear Drive Pulley Upgrade

Hennessey Embroidered Headrests

Crank Damper Pin Assembly Upgrade

Serial Number Plaques

Upgraded Thermostat

MAMMOTH Custom Front Bumper

Heavy Duty Supercharger Belt

MAMMOTH Custom Rear Bumper

Upgraded Spark Plugs

LED Lights in Front Bumper

High-Flow Fuel Injectors

20-inch Hennessey 10-Spoke Wheels

High-Flow Filtration System

37-inch Off­-Road Tires

Crank Case Ventilation System

Front Leveling Kit

HPE ECM Calibration Upgrade

Upgraded Electronic Fold Out Steps

HPE TCM Calibration Upgrade

Hennessey & MAMMOTH Exterior Badges

All Necessary Gaskets & Fluids

Professional Installation

Chassis Dyno Testing

Limited Edition – 12 per year

Road Testing (up to 200 miles)

2-Year / 24,000 Mile Warranty

Package prices & contents subject to change. Contact Hennessey Performance for details.

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