This single shaft is the same design that The Driveshaft Shop has been using in most modern muscle cars for the last few years, and it is a proven/trouble free rear shaft for the 2012-13 Jeep Grand Cherokee SRT with the NAG1 transmission. This shaft will replace the stock rear shaft, and it will eliminate the disconnected feeling you get from the stock shaft. With this new Aluminum unit, (also available in carbon fiber) that uses a custom CV at one end with a billet flange and plate at the other, will make the car feel more connected/athletic. The feedback from the gas pedal will be more responsive, and this will decrease 60ft times at the track. This is balanced like all shafts on The Driveshaft Shop’s 9500rpm balancer, so you know it’s done to the best standards available today.