Evening all 

after telling everyone how reliable my sons Fabia has been over the last few years I jinxed it!…

it’s developed a serious vibration at 50mph and above. No wheel bearing noise 

I’ve had it on the ramp and whilst one of the drive shaft boots has gone slightly on the left front i think it’s a red herring. 
there is some backlash in the transmission

cv joints are in in lock both sides.

clutch doesn’t appear to be slipping

I fear it’s the box 
 

Wheel balance checked all round? Tyre condition likewise?

8 minutes ago, Breezy_Pete said:

Wheel balance checked all round? Tyre condition likewise?

First thing I checked when the vibration started but now much more severe 

My first suggestion would've been to look at the tyres too. Try rotating the tyres front to rear and see if than makes any odds.

 

You say it only happens over 50mph, is that in all gears or a particular one?

Definitely not tyres. All gears over 50mph. 

On 14/06/2023 at 07:38, Mk2fab said:

Definitely not tyres. All gears over 50mph. 

Does it do with when you disengage clutch engage neutral above 50mph?

Yes