Bought 2015 Mustang Convertible V6 new and immediately had a sever vibration issue, especially at 70mph.

Tires were louder than my mudders on my Jeep. Took back3 times to have tires rotated and balanced. Nothing worked, vehicle unsafe at highway speed. Some suggestions about swapping out drive shaft or replacing tires. Decided to install new tires and went with Cooper Zeon RS3-A (good enough for all Roush Mustangs - good enough for me) and all the problems went away. All the vibrations, noise, etc. Much better ride quality and improved handling. Goodyear warranty was worth zero dollars towards replacements. I'll never own a set of GY's again. Their absolute junk.

Vibration between 50-60...dealer said it was tires...tested tires and was told one of the tires was "chewed up". After one month of waiting found out dealer lost all paper work and never submitted problem to Ford...redid tire testing and told tires fine.....finally dealer checked with Ford and was told this problem was caused by defective differential which they replaced. Tried to pick up car last night and headlights didn't work....told that my body control module computer is fried and needs to be replaced. Haven't road tested car yet.

What a mess.

Bought the car new, personally drove it for 10 miles, then parked it up to four months and when I returned to use it the car had a terrible vibration at between 30-70 mph. I was very concerned as passenger seat vibrates badly, interior mirror shaking. Thought the car had problems in drivetrain as the steering wheel has no particular vibrations coming through it. Took car back to dealer under warranty, and was told it may have flat spots on tires, my fault for not using it daily,?!? Through parking it up for four months, and then they thought the differential was bad.

So they put request into Ford for new tires to eliminate them as a problem. Then told New Pirreli Zeros were on back order and told to wait,- but for how long I said? Do not know was answer.I said NO ! Try another set off a new car on the sales lot. And guess what,-it was just as bad? This was a similar car ready for sale nearly four months newer than my car. Told me to wait for the back ordered tires. I said NO, they may be bad again- please give me a set of a different brand of tire.

After some issues,and complaints to owner of the dealership I had a set of the equivalent B F Goodrich equivalent fitted. Now all is cured!! So far. Be aware that Pirelli P Zero tires have issues, I have Googled this and see others have had problems.

FORD -please advise, Pirelli,that these tires are NOT GOOD ! They are causing issues.Buy Mitchelin or BF Goodrich to cure the problem.

Car was originally taken to dealer with a vibration between 55-80 mph. Dealer balanced tires and said problem was fixed. Drove away and the car still vibrated. Returned car to dealership and they test drove with Ford vibration software hooked to car. Dealer said drive shaft was out of balance so they sent it out to have balanced. It couldn't be balanced so they replaced drive shaft. Drove away and the car still vibrated. Returned car to dealership and they tried to force balance the tires (20" Pirelli P Zero) and they couldn't be balanced. Dealer replaced all 4 tires with new tires (20" Pirelli P Zero). Drove away and the car still vibrated. Returned car to dealership and they again test drove with Ford vibration software hooked to car. The dealership sent the data to Ford for analysis. The response from Ford was that it was within specs (what specs).

They recommended that the dealer find a similar car to test drive for comparison. Returned to dealership later and test drove a 2016 Mustang GT with 20" Pirelli P Zero tires and it had a similar vibration, but not as bad as my car. It sounds like Ford Motor Company has a problem with the new Mustang design, which they don't know how to fix. I have filed a formal complaint with Ford customer service and have a case number. We'll see where it goes from here but this vibration is definitely "NOT ACCEPTABLE". This car hasn't even had it's first oil change yet.