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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.

Chrysler Recalling Nearly 907,000 Cars, SUVs

Nearly 907,000 Chrysler, Dodge and Jeep SUVs and cars are being recalled for alternators that can fail and heated power mirror wiring that can short and cause minor fires. The recalls, posted Thursday by U.S. safety regulators, push the total number of recalls so far this year 544, totaling a record of more than 52 million vehicles. The largest of Thursday's recalls covers nearly 470,000 Jeep Grand Cherokees, Chrysler 300s, and Dodge Chargers, Challengers and Durangos from the 2011 through 2014 model years. The alternators can fail, causing the 3.6-liter V6 engines to stall unexpectedly. The problem also can cause the electrical system to fail, as well as knock out power-assisted steering, antilock brakes and electronic stability control. It can even cause fire or smoke, according to documents Chrysler filed with the U.S. National Highway Traffic Safety Administration. NHTSA opened an investigation into the problem in July, and Chrysler began its own probe in August. The company analyzed warranty complaints and alternators that had failed. The alternator generates electricity to recharge the battery and run other devices. Chrysler investigators traced the problem to heat fatigue in an alternator diode. Chrysler said it received 322 complaints about the problem, while 55 people complained to NHTSA. The company said it knows of one crash related to the problem, but no injuries or fires. The company will replace the alternators with upgraded versions for free. Owners will be notified in November. The company says customers who see warning lights or suspect a problem should contact their dealers. The recall affects cars and SUVs sold mainly in the U.S. and Canada, but some were sold in Mexico and overseas markets. The second recall covers almost 437,000 Jeep Wranglers from 2011 through 2013. Water can find its way into the heated power mirror wiring harness and cause corrosion. That can cause a short and could cause a minor fire and smoke, as well as cause loss of function of the mirror. The problem was discovered in February after three Wranglers in Canada were damaged. Chrysler says it has 26 complaints about the problem, but it knows of no fires, crashes or injuries. Dealers will move the wiring and install a protective shield to keep water out at no cost to owners, starting in December. Most of the Wranglers are in the U.S., Canada and Mexico, but more than 78,000 were sold overseas.

2014 Easter Jeep Safari kicks off with six concepts

The 2014 Easter Jeep Safari is set to begin this weekend in Moab, Utah, and while it's sure to be a blast for Jeep enthusiasts from all corners of the world, we're looking forward to the wild, off-road ready concepts that Jeep will be bringing to the red rocks. As you can see in our handy headline, there are six such vehicles in total, each of which sports a variety of tweaks and custom bits.
Unlike in years past, where Jeep graced us with some outrageous concepts like the Mighty FC or J-12, this year's vehicles are a bit more restrained and a bit more buildable by enthusiasts. That's not by accident, officials tell us. They wanted to put this year's focus on attainable vehicles and accessories from Mopar and Jeep Performance Parts that existing owners can use to augment their own vehicles. So let's get to it.
We'll start with the Wranglers first. There are three concepts of the jeepiest of Jeep coming to Moab - the Level Red, Maximum Performance and Mojo. The Level Red and the Mojo (seen above) are similar from a suspension and engine standpoint. Both boast a two-inch Jeep Performance Parts lift kit, which officials tell us is coming to market in the next few months. There are a pair of Dana 44 crate axles on both the front and rear, while a Jeep Performance Parts Rock-Trac transfer case has been fitted. The 3.6-liter V6 engines on both Jeeps can breathe a bit easier thanks to a new cold-air intake and exhaust system.