Hi, I am getting a little vibration from the driveline on my 82 S3 as i pass about 30-35mph and then it goes away as i go faster or slower. Its not severe just a moderate vibration.
Any suggestions where to start with this? where to look? Best of my recollection i replaced the universal joints on the prop shaft and the 2 halfshafts when i overhauled the rear suspension cage about 2-3k miles ago.
Thanks

 

Take a look at the centre bearing in the two piece propshaft between the gearbox and the rear axle.

 

As I recall, the Jaguar Workshop Manual had an instruction in it related to this. The propshaft centre bearing mounting is bolted on with slotted holes on the mount to allow it to be moved left-right. The instruction was to move it to the right (looking forwards) until the vibration disappeared. I also recall that I had to do this to my car. Sorry, this may all be crap, but memory fades as it was around 1996 when I got the car on the road again, (sold 2003). I owned the car 14 years.