Right-hand-drive Hennessey Mammoth 900 for sale

A Blighty-prepped, 912hp American mega pickup? You betcha

By Cam Tait / Wednesday, 20 December 2023 / Loading comments

There are countless reasons why we never gelled with the American pickup truck on this side of the pond. They’re massive, for one thing, with all but the dinkiest of trucks (a Ford Ranger is considered a ‘compact’ over there) requiring wide load support vans to guide you along our skinny roads. Despite being the size of a small freighter, they’re better suited to hauling than carrying, and they all seem to have a drinking problem. For most people, US pickups are simply too big, too thirsty and too vulgar to take seriously.

Good thing we’re not like everyone else, then, because we can’t help but feel a twinge of want when presented with a bungalow-sized pickup equipped with a big V8 up front. And, in case you haven’t been paying attention, American truck makers have started making pickups with hypercar levels of horsepower and even some that are specially engineered for track use. Both completely pointless, but you’d want to have a go in one, right? Thankfully, there are importers out there who are willing to go through the rigmarole of bringing some to the UK. Just a shame they’re all left-hand drive.

Well, all but one. This is Dodge Ram TRX and if you take a peek inside you’ll spot the steering wheel is on the side God intended. Turns out one of the previous owners had the driving controls switched over to the other side to make life with an American pickup truck that little bit easier in the UK. This can’t have been an easy (or cheap) process, but we’re guessing the dash, pedals and other gubbins bespoke to right-hand drive models were plucked from an Australian-spec TRX and bolted onto this US-spec truck.

Wouldn’t it have been easier to just import an Aussie version, you ask? Well, this isn’t any old TRX – it’s a Hennessy Mammoth. Specifically, it’s the 900 model, which packs a 6.2-litre supercharged Hellcat V8, which, thanks to some fettling by the Texan tuner, produces a monstrous 912hp and 873lb ft of torque. Enough to haul a whole forest’s worth of logs, and fire the near-2.9-tonne pickup from 0-60mph in 3.7 seconds. So fast is the Mammoth that, when benchmarked against the standard Hellcat-engined TRX over a quarter mile, it pulled out several car lengths. Admittedly, the test was run by Hennessey, but watch the accompanying video and you’ll notice a huge amount of rear squat. They really weren’t hanging about.

Anyway, this car looks a bit different from the one in the Hennessey video, and that’s because it seems to have had every option under the sun thrown at it – including the tuner’s off-road kit which includes those aggressive bumpers with integrated LEDs. Those 20-inch wheels are also Hennessey’s own design and come wrapped in heavy-duty, 35-inch off-road tyres. Not that this 3,000-mile example looks like it’s ever seen a puddle, but good to know it’s up to the job of, I dunno, herding sheep in a muddy field.

With that in mind, Mammoth would make a marvellous workhorse. It’s smaller than a John Deere tractor and although you won’t make any friends on the road, at least it won’t be because you’re trundling along at 15mph. It is tractor money, though, with the seller wanting £190,000 for it. Yes, it’d be a lot cheaper to buy in the US, but unless you live there you aren’t getting a Hennessey Mammoth – especially one with the steering wheel on the correct side. It may not be as practical as a Ford Transit, but it’s certainly more usable than anything else at this money. 


Engine: 6,194cc V8, supercharged
Transmission: eight-speed automatic, all-wheel drive
Power (hp): 912@N/A
Torque (lb ft): 873@N/A
MPG: c. 12mpg (stock)
CO2: N/A
Year registered: 2021
Recorded mileage: 3,000
Price new: c. $100,000 (plus $25,000 Mammoth upgrade)
Yours for: £190,000

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