1999 Jeep Grand Cherokee Limited 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.

Jeep Wrangler diesel likely after 2015 model refresh

We automotive journalists aren't always the right people to ask about whether a US-spec vehicle should or should not be offered with a diesel powertrain (hint: the answer is usually "YES"). But when it comes to the iconic, off-road-ready Jeep Wrangler, we aren't the only ones who have been clamoring for an oil-burning engine behind that famous seven-slat grille. To that end, it appears there's good news on the horizon, as Jeep CEO Mike Manley recently told Ward's Auto that the "Wrangler is on the radar to get (a) diesel."
"I'm confident that the Grand Cherokee will show just how large a demand there is for diesel, and I think what that will do is reinforce the need for us to target Wrangler as a vehicle that can take a diesel," Manley told Ward's. The most rugged of Jeeps is scheduled to get an overhaul around 2015-16, and the diesel powertrain will likely be introduced around that time.
This year alone, Chrysler will be adding a diesel engine to the Grand Cherokee SUV, as well as the Ram 1500 pickup and Promaster utility van.

Jeep teases pair of Moab concepts early

With the 47th annual Moab Easter Jeep Safari coming up at the end of this month, Jeep is preparing to roll out six new off-road-ready concept vehicles. The first two being teased are the Jeep Grand Cherokee "Trailhawk II" concept and the Jeep Wrangler "Slim," and while we have no information on either, we at least get an idea of what they'll look like.
We can't tell why this Wrangler is called Slim, but it has a nice black-and-red paint scheme with a serious off-roading front bumper and five-spoke beadlock wheels. There's even less we can figure out about the Grand Cherokee's Trailhawk II concept except that it appears to be painted up in the same Crusher Orange paint job as the recently introduced SRT Viper TA. We'll likely more of these as well as peeks at the other Moab concepts as we get closet to this year's Moab Easter Jeep Safari, which will be held March 23 through 31.