HomeNews and EventsHennessey to produce 6x6 truck with 1,012 horsepower

Hennessey to produce 6×6 truck with 1,012 horsepower

The Mammoth 1000 6x6 is based on the Ram TRX


Hennessey Performance is building its biggest truck ever and the Mammoth 1000 6×6 TRX lives up to its name. Based on the Ram TRX, the Mammoth is nearly seven-feet high, with an 88-inch width and is almost 24-foot-long. This six-wheel truck towers over its four-wheel based peers.

“Everything we do at Hennessey Performance is turned up to 11, but the Mammoth 1000 6×6 is definitely turned up to 12,” said John Hennessey, founder and CEO of Hennessey Performance.

Hennessey Mammoth 1000 6x6 TRX
Photo courtesy of Hennessey Motorsports

It’s powered by a 6.2-liter supercharged V8 Hellcat engine, that produces a factory-rated 1,012 horsepower and 969 pound-feet of torque. Hennessey has upgraded the performance of the Hellcat engine by more than 300 horsepower with a high-flow 2.65L supercharger, fuel injectors and high-flow induction system.

Besides the beefed-up engine, the Mammoth 1000 6×6 TRX has locking rear axles and a Bilstein suspension. It rides on 20-inch wheels wrapped in 37-inch off-road tires. The Mammoth builds on the base Ram TRX by adding a third axle that extends the truck’s length by more than four feet.

Specifications: HENNESSEY MAMMOTH 1000 6×6 TRX 

MAMMOTH 1000 6×6 TRX 
Upgraded High-Flow Supercharger SystemThird Axle with Lockable Diff
Supercharger Front Drive Pulley UpgradeExtended Wheelbase and Bed
Supercharger Rear Drive Pulley UpgradeHennessey Embroidered Headrests
Crank Damper Pin Assembly UpgradeSerial Number Plaques
Upgraded ThermostatMAMMOTH Custom Front Bumper
Heavy Duty Supercharger BeltMAMMOTH Custom Rear Bumper
Upgraded Spark PlugsLED Lights in Front Bumper
High-Flow Fuel Injectors20-inch Hennessey 10-Spoke Wheels
High-Flow Filtration System37-inch Off­-Road Tires
Crank Case Ventilation SystemFront Leveling Kit
HPE ECM Calibration UpgradeUpgraded Electronic Fold Out Steps
HPE TCM Calibration UpgradeHennessey & MAMMOTH Exterior Badges
All Necessary Gaskets & FluidsProfessional Installation
Chassis Dyno TestingLimited Edition – 12 per year
Road Testing (up to 200 miles)2-Year / 24,000 Mile Warran

Hennessey will produce a dozen Mammoth 1000 6×6 TRX trucks and the $449,950 starting price includes the base Ram TRX.

David P. Castro
David P. Castro
The Santa Rosa, California native is an experienced automotive and motorsports writer with a passion for American muscle cars. He is a credentialed automotive, NASCAR, and IndyCar reporter that graduated from the University of Nevada. A devoted F1 and NASCAR fan, he currently resides in Phoenix, Arizona with his wife, son, Siberian Husky, Mini Cooper, and 1977 Chevrolet C10.


  1. What does anyone do with a6X6 and 1000+ HP, in what will always be, a light truck?
    Yeah, well OK, it will raise eyebrows.


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