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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.

How to update and secure a vulnerable Chrysler Uconnect system

If you own one of the 1.4 million vehicles affected by the recent Chrysler software recall, you may want to watch this video. In it, we explain how to get the latest infotainment software loaded onto the 8.4-inch Uconnect system. The recall was a response to the findings of researchers who were able to hack into and remotely control a 2014 Jeep Cherokee through its cellular connection. Although Fiat Chrysler has worked with Sprint to plug most of the holes on the carrier side, there are still some vulnerabilities that only this latest software version can patch. Owners have three options to get the update: download it now, wait for a USB stick in the mail, or take the vehicle to an FCA dealer. Chrysler will be sending USB sticks loaded with the software update to customers. Anyone with an internet connection and a USB stick of their own with at least 4 GB capacity can speed things up by downloading the patch from the Uconnect website. We cover that process from start to finish in the video, with the final portion still applicable to those using the FCA-supplied USB stick. If after watching this you still don't want to tackle the patch yourself, you can take your vehicle to the dealer to have it done. Also note that this process is the same for all Uconnect updates, not just the one patching the exploits. Our demonstrator vehicle is a 2015 Ram 1500 pickup. The procedure should be very similar on other products with the 8.4-inch Uconnect system, with only the location of the USB port varying. Once you have the USB stick with the software on it – either after having downloaded it yourself or receiving it in the mail from Chrysler – the installation process is relatively simple. It takes about 15 minutes to perform the update; we edited out the wait in the video. To check whether or not your car's 8.4-inch Uconnect system is running the latest software, go to System Information on the touch screen's Settings page and look at Software Version. The update related to the recall is version 15.17.5. Related Video: Recalls Chrysler Dodge Jeep RAM Safety Technology Infotainment Videos Original Video hacking

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.