Brucey wrote:FWIW it is possible (easy in fact...) to install the guibo the wrong way round. This can create all kinds of weird vibrations that are sensitive to the torque in the drivetrain too. Worth double checking this!
Also, apologies if this is obvious, but if the gearbox mountings are in bad shape, this can cause all kinds of trouble too. It is best to check these by holding the gearbox on an axle stand and then remove the crossmember and/or mounts. They quite often delaminate in a way that isn't noticeable unless you make a special effort to check them.
cheers
1) Thanks Brucey

, finally got a chance to take a few pics of the new
guibo below, it actually looked quite similar on both sides to me, from what you can see from these pics do you think it's been mounted correctly? Should I be looking for some particular visible feature or writing?
I got the mech to go through the center bearing preloading process again just to make sure. He fixed the shaft in place and left the
centre bearing loose and secured it for last after preloading it by 5mm towards the front, is that the correct procedure?
Unfortunately the vibration is still there
](./images/smilies/eusa_wall.gif)
, but I can now be more precise, it can be distinctively felt between
1500 and 2400 rpm in 1st and 2nd during a vigorous acceleration. In 3rd it is much less noticeable...
2) Brucey, no suggestion is never too obvious for me

. But yes, I already put new original
gearbox mountings 2 years ago, thanks…
Any more guesses?
nick88highline wrote:I replaced my propshaft with a new one (from BMW) a month ago and I've got vibration at the speeds you originally posted about! I'm wondering whether this is a more difficult task than the manuals make out...although I cannot see why.
It sounds like your 20mph vibration may be related to the centre bearing pre-load. When the propshaft is installed the centre bearing mount should be pushed forwards by about 4-6mm for these later cars. If it is not the shaft can wobble around at low speeds, particularly when accelerating, but I'm sure whoever installed the shaft knew that.
Dear nick88highline, thanks for your kind support

, I got the mech to re-check that the centre bearing had a 5mm preload towards the front, unfortunately no luck, the vibration is still there.
Concerning your problem, I can tell you that in my case the cause was almost 100% due to a totally shot propshaft
damper, the one that sits around the guibo, my one had nearly all of the rubber gone, of course I also changed all the rest (except for the propshaft itself) that is damper, guibo, centre bearing, centring bush and both swivel joints, but the damper was the one in the worst condition. After that the vibrations at 60 and 120 have completely disappeared!
I guess you already changed your damper?
Thanks for your help guys
Danny