Hi

My 300 tt auto has a vibration through the floor and seats feels like the rear of the car or prop

It happens on the motorway after 85 MPH and gets worse the faster you go

There is no play in the wheel bearings or any of the bushes on the back end

I have heard from other threads about the prop centre bearing does anyone know how to check this before i replace

 

Thanks Chris

Chris - start with the exhaust hangers - they sag with age and the weight of the exhaust pulls down the rear gearbox mount making the prop out of alignment. Bluebird hangers will do the job. £20

 

If it still vibrates, the next cheapest item is the rear gearbox mount itself. £60

 

After that people tend to replace the centre bearing but often they are ok. If you finish up removing the prop and the centre bearing looks ok, you can have the prop recon'd and balanced for about £70 - and they'll tell you wether the centre bearing needs replacing £160.

 

Good luck

 

Jack

I've had a vibration since fitting a new exhaust!!!!, my box just went bang too?????

 

hmmmmmmmmmmmmm

Exhaust hanger - took me 7 years to discover the reason... Tried everything - couldn't understand why the vibes kept coming back.

 

Sold the car last weekend...

 

Must wean myself off the forum.

 

Good luck

 

Jack

For 160 you could have a one piece prop made and do away with the center bearing

Chris - start with the exhaust hangers - they sag with age and the weight of the exhaust pulls down the rear gearbox mount making the prop out of alignment. Bluebird hangers will do the job. £20

 

If it still vibrates, the next cheapest item is the rear gearbox mount itself. £60

 

After that people tend to replace the centre bearing but often they are ok. If you finish up removing the prop and the centre bearing looks ok, you can have the prop recon'd and balanced for about £70 - and they'll tell you wether the centre bearing needs replacing £160.

 

Good luck

 

Jack

Thank you for your advice

Out of interest did the vibration get worse at high speeds or was it there all the time

I have put a decat system on the car but i hardly drove it before i fitted the new exhaust as the old one was blowing so i dont know if it vibrated before

 

Thanks again

Chris

Hi

My 300 tt auto has a vibration through the floor and seats feels like the rear of the car or prop

It happens on the motorway after 85 MPH and gets worse the faster you go

There is no play in the wheel bearings or any of the bushes on the back end

I have heard from other threads about the prop centre bearing does anyone know how to check this before i replace

 

Thanks Chris

 

First thing to check is the wheel balance. They will often need rebalancing half way through the tyre life. Think about it. The wheel was balanced for all the new rubber that now is no longer there.

 

The other thing to check out is your tyre's. This will show if they are waring unevenly do to incorrect toe on either front or rear. Which would give same symptoms.

 

Most comon of all is cheep to midrange tyes. Especially once they're part worn. Good rubber will keep you on the road in all weathers and be kind to your car and brakes.

 

Jack's Exhaust hangers suggestion would be my next port of call if above didn't find the cure. Then the centre bearing, then the diff and output shafts.

You read have to start with the basic's and not take a scatter gun approach or you'll end up changing stuff that don't need fixing.