88 FC Vert vibrations

[DaleJK]

Hi everyone, so I have an 88 rx7 convertible and the cars great loving it so much right now, the only thing that sucks about it is that whilst driving once hitting about 3k rpm and up the car vibrates very violently, I've done some research into this problem and people say it could be the u-joints or engine or tranny mounts but mine all seem to be very solid. It does the vibration whilst moving and whilst in neutral whilst the car is stopped, I would love to fix this problem asap so if any of you could help that would be awesome, Thanks guys

here's a picture for all of you guys



88 FC Vert - Slowly Modifying
- Mod List -
- Racing Beat exhaust
- Klasse Motorsport rims