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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 reveals annual Moab Easter Jeep Safari concepts

Jeep has unveiled its annual spate of concepts before the Easter Jeep Safari. Those start with the Grand Cherokee Trailhawk Concept (below left), complete with the company's EcoDiesel V6 engine. Designers threw in a set of 35-inch Mickey Thompson tires wrapped around 17-inch Rubicon wheels, and a set of custom fender flares help keep all that rubber under wraps.
Meanwhile, the Wrangler Mopar Recon (below right) packs a 6.4-liter Hemi V8 good for 470 horsepower. All that grunt gets to the ground via a five-speed automatic transmission and a set of a Dana 60 axles frond and rear with 4.10 gears. The Recon also makes use of a 4.5-inch prototype long-arm kit and a set of prototype eight-lug bead lock wheels.
The Wrangler Stitch (below left) builds on the momentum of the Wrangler Pork Chop Concept. Engineers once again set out to strike as much weight as possible from the vehicle, and actually managed to trim the curb weight down to 3,000 pounds. That effort has given the machine the same power to weight ratio as the Grand Cherokee SRT8. Plenty of carbon fiber, door deletes and a chrome moly roll cage all help trim those pounds, and a set of DanyTrac Pro Rock 44 axles with 4.88 gears and ARB lockers front and rear let this machine scramble over whatever is in its path.

Chrysler recalling 630k Jeep models worldwide

Despite its refusal to recall 2.7 million Jeep Grand Cherokee and Liberty models this week over a gas tank fire risk, Chrysler will be recalling 630,000 Jeep Compass (pictured), Patriot and Wrangler vehicles around the globe for a pair of entirely different reasons.
The affected Compass and Patriot models are all from the 2010 to 2012 model years - 254,000 in the United States, 45,400 in Canada and 109,000 elsewhere in the world. In these models, a software error may result in the late deployment of the side airbags and seatbelt tensioners. In the event of a crash, failure of these systems could result in more serious injuries for the vehicle's occupants.
Jeep's go-anywhere Wrangler also faces a separate recall due to power steering fluid lines that can possibly wear a hole in the transmission oil cooler line. According to Chrysler, the vehicles could then leak fluid, possibly damaging the transmissions. Roughly 221,100 Wrangler models are being recalled because of this issue, all of which are fitted with Jeep's 3.6-liter Pentastar V6 engine. In the US, 181,000 vehicles are affected, with an additional 18,400 in Canada and 21,700 additional units worldwide. A Chrysler spokesperson said that no crashes or injuries have been reported with either case, according to the Associated Press.