I placed the Vogue on axle stands on Sunday and removed the rear wheels.
I measured the angle of the motor, so close to 0 degrees that it didn't matter. Then I measured the differential pinion angle. I did it two ways. The first was to place the level across the back of the diff flange. It calculated out at around 2.3 degrees. Then I used a trick I read about on a hotrodders forum. You align the tailshaft so the uni is pointing straight up and place a socket on the needle roller cup. The socket has to be the largest you can fit without it riding on the circlip. Then place the level on the top of the socket. That came out at just over 2 degrees as well.
We placed the jack under the front of the differential and jacked it until the pinion angle went to 0 degrees - the springs took it up easily. I thought I would have to loosen the U bolts (axle to springs) but it wasn't necessary.
Then we ran the drive system up to about 50km/h, noted the vibration (which I had hoped would be gone) and slowly released the jack - no change.
It was the same at 100km/h. Laurel thought it was a bit better but I was going for complete cure.
My next guess is the pinion bearing (somewhere in the middle of the night this occured to me). I quickly crawled under the car this morning and tried to give the pinion bearing a rattle - I grabbed the diff flange and wobbled it up and down with all my strength.
It felt totally secure - no give at all.
I'm now at the stage where I'm ready to find a good drive shaft specialist and give them the problem.
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