BenzWorld Junior Member
Date registered: Feb 2015
Vehicle: 1972 W114 250/8
Location: British Columbia, Canada
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Mine is the same.
For what it's worth, my 1972 250 sedan automatic with column shift exhibits exactly the same shift pattern as you describe. It kicks up into 3rd at around 55 mph or so, kicks you back in your seat a bit with the surge. No tach so no idea what the revs are, but they sound highish and if it was a manual tranny I'd have shifted up long before this one does for itself. :-)
I've put on several thousand miles since obtaining my 250 in January 2015, and though I still hold my breath a bit until it hits its cruising gear it's certainly not getting any worse. Nature of the beast, perhaps?
Would also be interested to hear opinions from those in the know as to whether this is "normal", or a symptom of a troubled (ie. worn out) automatic transmission.