Hennessey Mammoth

Hennessey Mammoth 1000 6×6 TRX: A Complete Review

Like the saying goes–everything is bigger in Texas–including the new Hennessey Mammoth 1000 6×6 TRX. This souped-up Ram truck is built by Hennessey Performance Engineering (HPE), a Texas-based hypercar manufacturer and high-performance vehicle creator. The company was founded in 1991 by John Hennessey when he took his love for performance and racing to the next level to create faster, more power vehicles. In 2021, the Mammoth 1000 Ram TRX was the most popular Hennessey vehicle paving the way for what’s to come with this 6×6. 

Here’s What to Expect 

With the production for this pick-up truck officially underway, the Mammoth 6×6 is by far the most powerful truck built by Hennessey Performance. It utilizes a 2021 Ram TRX as its base, adding an extra axle for two more wheels, upgraded off-road suspension, new front and rear bumpers, and other unique specs. Off-road customization is a thrilling experience and HPE definitely knows what they’re doing with this Mammoth 6×6.

Massive almost seems like an understatement with this truck. The Mammoth 6×6 measures 7.33 feet wide and is just shy of 7 feet tall. Those numbers are nothing in comparison to its length, which measures to be 283-inches, or almost 24 feet, long. Just in case you were worried that you might not be able to get in and out of this mighty pick-up truck, it comes equipped with upgraded electronic fold-out steps for all four doors. 

Hennessey added a third axle to accommodate wheels five and six. The truck features 20-inch 10-spoke Hennessey wheels with 37-inch off-road tires wrapped around them. 

Under the hood, Hennessey has exchanged the existing 717hp, supercharged Hellcat V-8 for a specially-tuned 7.0-liter Hellephant engine that now delivers a whopping 1,012 bhp. Additionally the torque has increased from 650 lb-ft to 696 lb-ft to help keep this monstrous truck moving forward. The Mammoth 1000 4×4 TRX goes from 0-60 mph in 3.2 seconds. It can reach a complete quarter-mile sprint in 11.4 seconds. But it’s expected the numbers will be quite longer for the 6×6 due to its sheer size and weight. 

Hennessey Mammoth performance always delivers

Only 12 Mammoth 1000 6×6 TRX trucks will be produced each year. Of course, that’ll cost you a pretty penny! Pricing starts at $449,950.

John Hennessey, founder and CEO of Hennessey Performance Engineering, addressed the production of this truck with the statement, “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.”

The company has also produced over 20 VelociRaptor 6×6 and Goliath 6×6 Silverado trucks to customers all across the globe. In addition to exquisite attention to detail, Hennessey provides extensive warranties for their models. What’s more, the Mammoth 6×6 comes with a comprehensive 2-year / 24,000-mile cover. 

The most powerful and most expensive vehicle Hennessey has built to date is now rolling through the production lines. Drivers can order the Mammoth 1000 6×6 TRX through authorized Ram retailers or directly with Hennessy.


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Linzi Martin
Linzi Martin has worked as a content manager, consultant, and writer for the past six years. She's handled everything from blogs and articles to e-books and social media content. Her work has been featured in various publications including Apartment Guide, The Startup, and Voyage Magazine. Outside of work, Linzi enjoys staying active, frequenting new restaurants around South Florida, and spending time with her family.

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