Im bumping this because my 2014 sport has a vibration too....here are the notes that I've made based on when I can hear the noise:
1- Normal 4WD Anytime cruising, accelerating or decelerating through 47-48 mph. Noise level low
2- Normal 4WD- same as above, unless accelerating while losing grip to front wheels between 46-50mph, and torque being distributed to rear wheels. Noise level high when wheels losing grip (noted because it is snowing here, so lousy road conditions allow for slippage of wheels thus torque transfer to rear of vehicle).
3- Sand 4WD- same as 1, unless accelerating between 46-50mph. Noise level highest.
4- Snow 4WD- same as 1, unless accelerating between 46-50mph, noise level slightly less than when in Sand, noise almost identical to note
#2
5- Noise independent of gear/engine RPM. Tested all of above scenarios in various gears. Noise always louder when more torque is distributed to rear wheels, however noise is always present when vehicle is moving 47-48 mph regardless of whether I am on gas, braking, cruising.
6- Noise appears to be coming directly under center console shifter area, where driveshaft brace/bushing is located.
VERY slight shudder in the pedal. Nothing detected in steering wheel. I hear it more than I feel it, its a low pitched hum.
BTW, I have 1200 miles on my 14 ex sport. Had it into one dealer who claimed that they felt the same thing in another used sport they had on the lot. Luckily Crystal is already involved, and its going to a different dealership on Thursday.
Completely unacceptable for a 50k car, which as of this moment makes more drivetrain noise than my 07 mustang GT with 3.73's and a 5 speed manual.
