Spacers between center bearing mounts to reduce takeoff vibration

[synoptica]

Hey guys,

After finally fixing most of my diff/tailshaft woes I've been having today (thanks to the replacement of the bolts that hold the diff/tailshaft together and a new rear uni), I'm pretty happy with the result, but the vibration on takeoff is still a bit annoying.

I came across this page some time ago which advises that the mount point of the centre bearing needs to be lowered using spacers to correct the angle of the shaft due to the car being lowered: http://au.geocities.com/commodoretech/kdifftail.html

Has anybody actually done this, and does it make a difference?

Cheers,
Chris.

[Not_An_Abba_Fan]

Vehicles with FE2 suspension have the spacers on the centre bearing mount from factory. What they indeed do is correct the drive angle to the diff and take out dynamic vibration of the rear uni as it spins up to speed. I don't know the size of these spacers, 8mm I think, but don't quote me.

[synoptica]

Well I could always experiment with washers until I get the best result - what's the worst that could happen?

Though that said I've already got factory spacers in there that look around 8mm...

This could also answer why my rear uni failed after 2 years...

[SL/ENUT]

I think when you seriously lower a car, you need to add some spacers to the centre bearing bracket. Dads VB has some spacers there, been there since he has had the car, which is about 1984/1985.

[robbo10]

You haven't re-assembled the tailshaft 90 degrees out have you. You did mark the tail-shaft, before you pulled it apart. So that when you put it back together it was all lined up as from the factory.

[synoptica]

How could I redo it 90 degrees out?

The holes in the diff flange only match up with the tailshaft flange one way - I could see how it could be 180 degrees out (which wouldn't matter obviously) but not 90 degrees...

Oh - wait - I didn't pull the shaft apart - only out...