Thanks again to the form, I found a post (2003) relating to my problem with subtle steering drift. The problem was that in adjusting the steering box, I did not leave enough play in the steering. This caused the steering to be stiff and at highway speeds, did a subtle drift, side to side. Adjusted it back a little today and it is now good.

The challenge with searching the forum, is that there are so many posts resulting from a search and it takes a while to look for the right answers.

So I'm down to the final question relating to the transmisson - smooth shifts with fast starts, and harder shifts with slower acceleration, Any ideas here?

Could my vacuum be low?

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1961 220SB Hydrak
1966 230S - Too Good for Parts
1981 300SD - now in Oakville