Originally Posted by Diesel911

I tried to copy this word for word from the Factory Service Manual:

"The components of the Propeller Shafts are individually pre-balanced at the Factory. To eliminate any residual unbalance which might still remain, re-balance the complete propeller shaft including the companion plates. For this reason, when disassembling the complete propeller shaft (e.g. when changing the propeller shaft intermediate bearing) mark individual components in relation to each other (if no marks are in place) and reassemble to the original shape.