JDARJISJ
From your recent videos on the vibration issue I was very surprised to hear you say that you thought it was in the driveline, not the transmission. Now you swapped this in but taking it up to speed to see how bad it vibrated wasn’t the first thing you did. It is as if you didn’t want the transmission to be the cause.
Glad to hear it is fixed though. You are an inspiration to a lot of guys who want to tinker with their cars.