Mustang - bad flywheel?

well Ive been driving 35 yrs been working on cars about that long as well and ive never had to replace one and ive done some really hard driving.... they just dont want to fix it but yet it should be under the drive train warranty just tell them to fit it or call the company... and really i know when i had my mustang it got drove like it stole but either way they should fix it... make a sign saying i brought this car at and they dont up hold their warranty and park it across the street