You could indeed get drive line vibration from a misaligned propshaft.
The splines on my PV's propshaft have an arrow and a raised dot which you are meant to align. (Tis Hardy Spicer)
If you remove the propshaft it is worth while feeling the universal joints (UJ) for either looseness or stiffness - either can also cause strange vibration. If you are not planning to remove the propshaft you might be able to feel slack in a well worn system by holding one end and trying to twist the other end. Not the best way but might give an idea where problems might be.
The resilient centre bearing mount is also a possible problem if it is worn.
When was the last time you greased the UJs?
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