06 Jeep Grand Cherokee Limited 4x4 on 2040-cars

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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.

NHTSA closes probes on Jeep Grand Cherokee, Ford Freestar and Mercury Monterey

The Detroit News reports the National Highway Traffic Safety Administration has officially closed its investigations into 2012 Jeep Grand Cherokee, 2004-2005 Ford Freestar and Mercury Monterey models. The separate probes found no issues that pose safety concerns. NHTSA began investigating certain Grand Cherokee SUVs over complaints that power steering hoses could detach during operation, thereby increasing the risk of a vehicle fire. Of the 24 reports of failure, none alleged smoke or fire in the engine bay, and Chrysler has since modified the power steering cooler assembly to reduce the likelihood of the failure.
Meanwhile, certain Ford Freestar and Mercury Monterey vehicles garnered a government probe after receiving complaints that the models were equipped with faulty scissor jacks. The agency had received six reports of the jacks failing or causing injuries, including one incident that resulted in a fatality. But NHTSA says the jack failure rate is similar to those found in other vehicles. In those six cases, the government agency found the jacks were being used for something other than changing a tire, and investigators could not determine whether the emergency brake was set or the rear tires were properly chocked.

Jeep Chief and Wrangler Red Rock Responder teased ahead of Easter Jeep Safari

Jeep is being coy about it's lineup for the 2015 Moab Easter Jeep Safari, releasing just a pair of shots and an exceptionally brief press release on two of the seven concepts coming to the desert later this month. So, what can we glean from the limited assets that have been given to us? Well, as we said, we know Jeep is bringing seven vehicles to its big festival. We also know the names of two vehicles, shown above – there's the Chief and the Wrangler Red Rock Responder. Which is which? A fair question. We're betting the second image is the Wrangler-based Red Rock Responder. As for the Chief, well, we've absolutely no idea what to expect there. Jeep's Moab concepts generally include the model name on which their based – see the Grand Cherokee Trail Warrior and Cherokee Dakar from last year, or even the Wrangler Red Rock Responder, mentioned above. There's no such moniker on the Chief. As for the Chief's illustrated teaser image, as we said, it doesn't reveal much. The body is angular, and quite Jeep like, with squared-off wheel arches and decidedly old-school taillights. Beyond that, though, we don't have much to go on. Expect much more not just on the Chief and Red Rock Responder, but on all seven of the concepts Jeep is bringing to Moab. The party starts on March 28 and runs until April 5. Be sure to check back then for full coverage. Related Video: