I have a 2019 Fiat 124 Spider manual. I had it since April, and a few weeks after I got it, the transmission started vibrating alot. It's consistent though when the AC is off, then it's a little worse. The shifter vibrates, and sometimes third gear grinds. Other gears feel like they're going to, but don't. A couple times you couldn't put the shifter into first at all. Vibrations spread through the pedals and steering wheel. The whole car when on a cold start. Bad enough that my hands and feet get a little numb. Theres people certain I got something going on, since others who have this car say theirs don't do this. The problem the issues probably internal and I haven't been able to find someone to inspect inside. I'm currently going to auto school so if I can't find anyone, I'll just do it myself, but it'll be a while. I understand that since the trans is like, right under the console, you'll feel a little bit of something, but I really doubt it's supposed to be anything dramatic. You can just watch the shifter shake at idle.