One problem related to noises during shifting has been reported for the 2014 Jeep Wrangler. The most recently reported issues are listed below.
I just drove my vehicle and then parked it at my home on a driveway that has a slight incline. I parked vehicle in 1st gear (6 speed manual transmission), and applied the parking brake. Approximately 10 minutes later I was in my yard and heard a muffled pop noise and then a clicking sound that resembled a roller coaster ride when the cars are being pulled up a steep hill. I turned around and saw my vehicle going down the driveway. It collided with my wife's vehicle then hit a tree. The vehicle has 2800 miles on it. When I got in vehicle the shift was in 1st gear, and brake applied. I started the vehicle and let off the clutch and the vehicle moved forward, indicating that it was in fact in first gear still. I duplicated where I parked it again and it moved backwards again. After multiple reenactments the vehicle would move until 3-5 min later it would make a sudden movement in reverse for about 6-12 inches.