Conversation Between ThoR294 and 6pdx

I read some of your posts about your vibration but haven't came across what it ultimately was. Did you ever find out what caused your vibration?
I have a vibration and it seems very similar to yours. It starts around about 65mph. I've switched driveshafts and re-balanced my rear wheels. I'm thinking it still could be the driveshafts, maybe the trans bushing.
Any help would be appreciated.
Thank you