Hi,

Now got 2L of oil in the gearbox... A bit embarrassing to think that I filled to the dipstick rather than to the correct volume of oil, but I've done worse I'm sure!.
For info, the "black" dipstick above from the Alfa166 / old 164 gearbox was the correct level in a Stratos with 2L of diff oil in.

CV Joints / spacers etc are all as original HAWK spec... so I'd like to think they have travel in them OK.

Just put the car up on blocks and run... No noise, but a very obvious vibration at around 40-50mph (Hard to tell cause my mechanical speedo no longer works ,and I'm still waiting for "Speedy Cables" to send the electronic version). Less speed OK and more speed OK, but there is a range where the vibration is very obvious.
That sort of ties in with what I hear on the road.

Tried rotation again on both back wheels and it does feel like the vibration may be coming from drivers rear... It's also a little out of true.

Off to the garage to check wheel balance and see if any of that helps.

Thanks for the comments above.