I have the drive shaft out of my parts car, ready to install into the real car ('78 300d) in an attempt to cure the vibration that has been present since I got the car.
The center bearing feels great, but it looks like it is falling apart, so I will replace it.
On the U-joint, there is a very definite detent at the center position of each joint. It spins well on the support bearing, but if you tip it off center you can feel the detents each time they come around. I assume that this is not normal.
What is in the u joints? Bearings? how are they replaced? they they look permanently installed.
thanks, Andy

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andy t
'78 300d
'95 volvo 850, wagon
'86 300sdl - engine out, maybe I'll have it rolling by June

whole bunch o' bicycles