So I had MK1 Escort off the road recently, reinstalled the drive shaft that's had a new Yoke and uni joints but not balanced, rebuilt 4.125 diff gears and new rear brake shoes & master cylinders.
The drive shaft & diff gears were done by a pro and I did the rear brakes.
When the car gets up to 100kph it starts to vibrate really badly. Was never an issue before I did these three jobs to it.
 
Any guesses? Noise seems to be coming from back left wheel at lesser speeds but after 100kmh the whole driveline starts wobbling

I have a spare tailshaft, will chuck it in tomorrow & see how it goes. 

Could be wheel bearings?
 
Matt

It was the tailshaft. Bloke reckons he set it up on the lathe but there's definitely a problem there!! Taking it back to him on Tues