Drivetrain massive Vibration

[F355GTS]

ECR, the movement is with the prop out ie I'm moving the splined shaft in hte back of the Gearbox

 

Paul/ battered, Yes we are getting a vibration through the whole car, fortunately Paul Gibb has come to the rescue with a prop I can try to eliminate it, i'm starting to believe it is the Diff though ☹️

 

Michael, yes checked the engine mounts andd the Alternator as Arnie suggested, all seem fine

 

Mark