Hennessey Mammoth 1000 Ram 1500 TRX Last Stand for a Special Edition of 200 Units

The Mammoth 1000 package launched for the 2021 model year at $135,350 including a donor car. At the time, Ram listed the off-road truck for $69,995 excluding destination charge. With 2024 being last call for the 6.2-liter Hellcat and 5.7-liter HEMI in Ram’s half-ton truck lineup, Hennessey Performance Engineering decided to ditch the V8 with a bang. Enter the Hennessey Mammoth 1000 Last Stand, of which no more than 200 examples will be produced.

How is it different from Mammoth 1000? Simply put, a few decals here and there. Last Stand and Hennessey graphics on the side of the beds open the list of changes, as well as three-quarter rear views that further enhance the scheme with black graphics around the rear light clusters. The most popular tuner from Texas didn’t share any pricing information, but either way, you’re definitely looking at more than 135,350 eagles.

The Ultimate Stand is available in seven colors, starting with factory Pitch Black, Granite Gray, Bright White, and Billet Silver. The balance is new to Last Stand, with colors named Harvest Sunrise Orange, Delmonico Red, and Night Edge Blue. In addition to the larger charger and heavier charger belt, what other performance upgrades are included?

Hennessey is very responsible for working its magic on the transmission and engine control modules, damper pin assembly, thermostat, and spark plugs. The crank case ventilation system also needs to be mentioned, along with a three-year/36,000-mile (60,000 km) warranty. Of course, decorated headliners and serialized plaques for the interior and engine compartment are standard.

Photo: Hennessey

Every Mammoth 1000 Last Stand is randomly tested and road tested for up to 500 miles (about 800 km) before delivery. Customers who need more off-road capability are presented with the optional Mammoth Off-Road Package, which includes many goodies. Think front and rear stabilizers, 35- to 37-inch rubber on 20-inch wheels, Mammoth front and rear bumpers, LED front bumper lights, and electronic folding steps.

Two more options need to be highlighted, starting with transmission optimization. Considering the Mammoth 1000 Last Stand’s 1,012 horsepower and 969 foot-pounds (1,314 Nm) of torque, this choice makes a lot of sense. The Ram 1500 TRX uses a ZF 8HP 95 torque-converter automatic, which is officially rated at 900 Nm or 664 pound-feet of tire-shattering torque.

The final option is a set of Wilwood performance brakes which should help this fearsome behemoth stop better than stock. It will be sad to see the Ram 1500 TRX ride off into the sunset, especially when Ford and GM continue to make V8s for their half-ton pickups. All is not lost, though, because the 2025 Ram 1500 model year is no slouch either.

Instead of eight cylinders, the 2025 Ram 1500 can be equipped with a twin-turbo six in standard or high-output flavors. The latter makes 540 horses and 521 lb-ft (706 Nm), and yes, the RHO replacing the TRX will get said engine. It’s not exactly a Hellcat, but that kind of torque is enough for a half-tonner off the beaten path.