126 U-Joints
 

Are there any conventional u-joints (no the f/r flex joints) on the driveshaft of a 126 Mercedes V8? are there any in the rear end halfshafts? if so where are they located; any photo would be appreciated.

did you look under yours if you have a w126 or any mercedes of that vintage.

The W126 does not use U-Joints. The driveshaft lays in a straight line between the trans, the center bearing and the differential. It's important to make sure the flex discs are not under any misalignment loads. The engine and trans mounts must be good and not collapsed, the diff and rear suspension mounts must not be collapsed as well as the center bearing.

The older models like the W111 and the Ponton models with the swing axle do ise a U-joint on the aft section of the driveshaft because the diff does move when going over a bump.

I was wrong, there is a U-joint on the front of the rear driveshaft. See your post over on mercedesshop.