As long as the slip joint is on the transfere case side you cant really install it wrong. But if if you managed to get that wrong i doubt it would cause vibrations.

Are you on air suspension or coils? Ride height makes quite a diffrence to propshaft vibartions.
I was driving home, on a 500km trip when my compressor overheated and caused a soft fault so the car went to extended height. I pushed it abit to see how ride height affects the vibrations. Under 100kph if you paid attention you could notice the vibrations. 115kph they became very obvious. 130kph they got quite bad. But it was not a vibration that would appear at a certain speed and then dissapear as you went faster again. They got linearly worse and worse as speed increased.
 
Hmm something did occur to me. I removed the front prop last year as I had to replace the bolts for the output shaft speed sensor plate on the gearbox. I don't remember of the vibration was there before these works but I think not.

Can you install the prop the wrong way round? Could it be that I just flipped it back to front which would result in the u-joint phasing being out the wrong way?

I don't think so but I am sure someone has managed to get it arse about face.
 
As long as the slip joint is on the transfere case side you cant really install it wrong. But if if you managed to get that wrong i doubt it would cause vibrations.

Are you on air suspension or coils? Ride height makes quite a diffrence to propshaft vibartions.
I was driving home, on a 500km trip when my compressor overheated and caused a soft fault so the car went to extended height. I pushed it abit to see how ride height affects the vibrations. Under 100kph if you paid attention you could notice the vibrations. 115kph they became very obvious. 130kph they got quite bad. But it was not a vibration that would appear at a certain speed and then dissapear as you went faster again. They got linearly worse and worse as speed increased.
I am on air suspension which is functioning correctly and calibrated last year so that shouldn't be the issue. I played around with the ride height on the motorway but couldn't get a clear result as there was too much traffic.

I did install the shaft with the slip joint at the transfer case side.

I read an article posted in another in/out phase discussion which says that the UJ should be out of phase two teeth, equal to 45 degrees. That's certainly not the case. I think it's more like 20 degrees out of phase, which is apparently one tooth on the spline.
 
I just thought of it @ar1g3, are both the harmonic weights for your diffs still there and their bolts tight/rubber bushes still intact?
Yeah they are both there, and they felt solid when I grabbed them.

Rear one:
1000016544.jpg

There is a weird metal flakey thing on the prop in this picture, was this a weight or was this probably some kind of spec plate? Very thin, paper thin.

And the front one:
1000016460.jpg

Can't remember if he has petrol or diesel but the oil burner only has a rear one.
Its a petrol 4.0!
 

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