VIDEO: Hennessey Takes Its New TRX Mammoth 900 To The Dyno & Track:

HPE Amps Up The TRX To 900+ Horsepower...

Since the introduction of the 2021 Ram 1500 TRX, Hennessey Performance Engineering (HPE) has unveiled two different power upgrade kits for the performance off-roader. The first was a six-wheel-drive (6×6) variant, ditching the supercharged 6.2-liter HEMI HELLCAT V8 in favor of a tuned supercharged 7.0-liter (426 cubic-inch) HEMI HELLEPHANT V8 making 1,200 horsepower. Only three of those trucks are to be produced. The second was a 1,000 horsepower variant of the TRX, using the company’s HPE1000 high-performance package for the HELLCAT engine. Now, the Texas tuning shop has released details on a third package, as well as video of the truck in action for the first time.

2021 Ram 1500 TRX Mammoth 900 by Hennessey Performance. (Hennessey).

The new Mammoth 900 package, adds the company’s well-known HPE900 upgrade has already seen its way in several Challenger and Charger SRT Hellcat models, as well as the Hellcat-powered Jeep® Grand Cherokee Trackhawk, under the hood of the 2021 Ram 1500 TRX. The package is rated to boost the HELLCAT engine’s output to 912 horsepower and 873 lb.-ft. of torque. That is an improvement of 210 horsepower and 233 lb.-ft. of torque over the stock output.

2021 Ram 1500 TRX Mammoth 900 vs Stock TRX. (Hennessey).

The Mammoth 900 package comes with the following equipment…

• Lower Pulley Upgrade
• Upper Pulley Upgrade
• Ported Supercharger Snout
• High-Flow Fuel Injectors
• Crank Case Ventilation System
• HPE Calibration Upgrade
• Professional Installation
• Chassis Dyno Testing
• Road Testing (up to 200 miles)
• Hennessey Exterior Badge
• MAMMOTH 900 Exterior badges
• Serial-Numbered Plaques
• 3 Year / 36,000 Mile Warranty

On the dyno, in stock form, the 2021 Ram 1500 TRX puts down 607 horsepower and 593 lb.-ft. of torque to its rear wheels. After the HPE900 upgrade, the Mammoth 900 put down an additional 121 horsepower and 86 lb.-ft. of torque to the ground, equaling out to 728 rear-wheel horsepower and 679 lb.-ft. of torque. On the DynoJet, the Mammoth 900 sounds simply amazing when it hits its mid-range.

2021 Ram 1500 TRX Mammoth 900 vs Stock TRX Dyno Results. (Hennessey).

To show off the difference of power between the stock TRX and Mammoth 900, HPE also put a Mammoth 900 equipped TRX and a stock TRX to its track to see just how much faster is the HPE-built Mammoth. The Mammoth 900 did feature a set of 20-inch Hennesey wheels and 37-inch tires. According to HPE, the optional wheels and tires equal to a 50 horsepower loss on the dyno. On the track, the Mammoth 900 will pull about a 2 to 3 car gap on the stock TRX in the quarter-mile.

What do you think of the Mammoth 900 upgrade from HPE? Let us know in the MoparInsiders.com forums.

Robert S. Miller

Robert S. Miller is a diehard Mopar enthusiast who lives and breathes all that is Mopar. The Michigander is not only the Editor for MoparInsiders.com, 5thGenRams.com, and HDRams.com but an automotive photographer. He is an avid fan of offshore powerboat racing, which he travels the country to take part in.

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The TRX preserves the heritage, the bond if you will, of Ram and Dodge. In the minds of many of us old timers, these trucks will always be “Dodge Rams”. Another thought, it makes the transition of Durango from Dodge to Ram, as I predict once it joins the Jeep Wagoneer as a large, heavy, body on frame SUV, that much easier. I am confident on this move and to a Ram Durango TRX possibility. Yea, the TRX just keeps that Dodge link alive for Ram.
A Wagoneer sized SUV does not fit the Dodge brand performance image and so much better complements the Ram brand, this is obvious. Dodge should concentrate on its Stelvio spin off Journey replacement as the one and only SUV in the Dodge stable. Now that would be one heck of a Porsche fighter on a working man’s budget, with a name change of course.

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That thing hauls arse...

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