Get A Hennessey Mammoth 1000 TRX Last Stand Before It Goes Extinct

Ram Mammoth 1000s
Credit: Hennessey

The Ram TRX will not go quietly into the night if Hennessey Performance has anything to say about it.

The Texas tuning house has announced a “Last Stand” run of its outrageous Ram 1500-Based Mammoth 1000 TRX pickups.

The custom truck starts out as a factory Ram 1500 TRX, which went out of production in December along with all of Ram’s V8-powered light duty models.

They’re being replaced by pickups powered by turbocharged inline-six-cylinder engines that are more powerful than the V8s.

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ram mammoth red
(Ram)Credit: Hennessey

That is except for the high performance TRX. Ram CEO Tim Kuniskis said the model name is being put on the shelf … for now.

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Hennessey created the Mammoth 1000 TRX a couple of years ago by swapping in a higher-flow supercharger and new engine calibration that cranks up it supercharged 6.2-liter V8’s output from 702 hp and 650 lb-ft to 1,019 hp and 969 lb-ft.

(Ram)Credit: Hennessey

It can accelerate from 0-60 mph in 3.2 seconds and cover a quarter-mile in 11.4, making it quicker than a stock Dodge Challenger SRT Hellcat Redeye muscle car.

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An off-road package that includes steel bumpers, LED lights, leveling kits, electric steps and either 35-inch or 37-inch tires on unique rims is optional, along with a Wilwood brake kit with larger discs than the stock truck and a beefed-up transmission.

ram mammoth dash
(Ram)Credit: Hennessey

Hennessey will build a maximum of 200 trucks, which also get a graphics package and can be ordered in variety of colors.


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The Mammoth 1000 TRX upgrade is priced at $39,950 on top of whatever donor truck is used and comes with a three-year/36,000 warranty on the work, while the off-road package is $19,950.

This story has been updated with pricing information