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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.

eBay Find of the Day: 1977 Jeep J20 time capsule

Is it just us or has eBay really become, of late, a surprising time capsule of older, barely used automobiles? We've had the 2005 Porsche Carrera GT with 83 miles, the 2004 Ferrari Enzo with 175 miles, the 1987 Shelby Lancer with 22 miles, the 1989 Shelby Dakota with 23 miles - none of those four cars ever even registered - and the 1975 Cosworth Vega with 191 miles. You can add to that list a 1977 Jeep J20 - the kind of Jeep that enthusiasts point to when they beg the brand to make another pickup truck.
Listed on eBay by Masterpiece Classic Cars in Whiteland, Indiana, the Brandywine and Alpine White truck has used its 360-cubic-inch V8 paired with a three-speed automatic to go just 3,940 documented miles. Not surprisingly, it's listed in excellent condition and the images appear to bear that out. The three-quarter-ton pickup comes with its original manual and pamphlets, the Quadra-Track four-wheel drive probably just as ready to tackle the terrain as it was 36 years ago. If only it came with some John Denver to play in that AM/FM/8-Track stereo...
At the time of writing it hasn't garnered a single offer or bid, probably due to the above-top-dollar Buy It Now price of $34,900. Still, since this is likely the closest you'll get to a Jeep pickup for some time, we'd recommend admiring it in the gallery of photos above.