I just bought my first car it's a 1984 trans am, when me and my step dad test drove it had a pretty strong shake to it. We figured it was probably bad u joints or a drive shaft issues so we pulled the car home and jacked the car up and it looks like someone has recently replace the u joints and drive shaft and there is no play in it, so then we thought maybe its a transmission issue ? Bad Flexplate maybe. All the bolts in the bell housing look brand new like someone ether had a new trans put in or rebuilt it, I pulled the starter off and shined a light into the flexplate and it
​​also looks brand new. So I'm not sure where to star with it, when the car is in park and you rev it up you can feel a very strong vibration through the whole car. If anyone has experienced something like this let me know thanks !