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Watch this 650-hp Hennessey Jeep Grand Cherokee go from 0-60 in 3.9 seconds

Hennessey Performance Engineering has created an HPE650 package for the Jeep Grand Cherokee SRT fitted with the 6.4-liter Hemi engine. When it leaves the showroom floor it has 470 horsepower and gets from 0-60 miles per hour in 4.8 seconds. When it leaves Hennessey's garage floor after the upgrade it has 650 horsepower - 530 hp at the wheels, according to Hennessey - and gets to 60 mph in 3.9 seconds on its way to running the quarter-mile in 12.6 seconds.
There's more than just a Roots-type supercharger bolt-on, with ported cylinder heads and high-flow headers among the many changes made to the engine. You can watch this pre-2014 facelift silver model prove its spec sheet on the drag strip in the video below.

Jeep Wrangler Scrambler pickup spied in some scrapes on the Rubicon Trail

We've seen the Jeep Wrangler Scrambler pickup truck many, many times at this point, but every time has been on the streets. Now, thanks to some members of the Jeep Scrambler Forum, we get a look at the truck cruising on the Rubicon Trail. It's a fitting location, since that's where Jeep says it determines if a vehicle earns the "Trail Rated" badge of honor. We're pretty certain that the Scrambler will still earn the Trail Rated badge, since it has the four-wheel-drive, axle design and presumably the ground clearance of a normal Wrangler, which also earns the badge. That said, the photos from the forum do reveal some of the weak points one would expect from a stretched-out Wrangler. The lengthened wheelbase hurts the breakover angle and puts the rocker panels and frame at greater risk for damage. As pointed out in the forum, the camouflage looks pretty roughed up in those areas, and there don't appear to be any rock rails/frame sliders to protect it. The lack of them probably means this isn't a Rubicon model, as they're standard equipment on the Rubicon SUV models. If you plan to off-road a Scrambler, they're probably a wise investment. The other weak point is the large hangover from the truck bed. This is an inevitability for having a usable truck bed, especially on a four-door truck. But it means the departure angle is much shallower, thus the tail end is at risk of being dragged and damaged. Looking closely, and it appears that happened with one of the trucks, as the bumper looks angled upward as though it got snagged on a rock or bent after hitting the ground. These aren't risks exclusive to the Jeep Wrangler Scrambler, though. Any pickup truck taken off-road is going to have to contend with these issues. It's the tradeoff of having lots of cargo space and room for people, as opposed to the tidy little box that is the two-door Wrangler SUV. Related Video:

Jeep spied testing Hellcat-powered Grand Cherokee Trackhawk

The Jeep Grand Cherokee Trackhawk is coming. We know this, because Mike Manley, the head of Jeep, said so. We showed you this brief spy video a while back, but now we have our clearer images of the Trackhawk undergoing testing. And it looks just like a normal Grand Cherokee SRT. Yeah, anti-climactic, we know. The four shots we have show a bit of camo over the front bumper and grille, likely concealing a tweaked design or visible bits of the 6.2-liter, supercharged V8. It looks like there's a rather substantial opening below the upper grille, almost like a ram-air system. There's also a smidge of what looks like tape on the front wheel arches, although this might not mean much of anything. What's interesting is what isn't here. There's no perceivable change to the back of the car. The exhaust pipes look like they're about the same size, there's no noticeable changes to the aerodynamics, and in fact, there's not even any camouflage. Jeep also hasn't updated the Grand Cherokee Trackhawk's hood, which is somewhat surprising considering the changes for every other Hellcat-equipped vehicle (concepts included). You can check out our earliest look at the Trackhawk up top. As for when this monstrous Grand Cherokee will debut, we're expecting it to arrive sometime in 2017, perhaps on FCA's home turf at the Detroit Auto Show. Related Video: