I also remember this being discussed somewhere but haven't found it. From what I remember there was a "damper spring" that existed on the manual version IP but was not on the auto version. There was confusion whether one could purchase this spring and install it on an auto IP after a 5 speed conversion.

EDIT: Found the thread. Post #13 starts the discussion of an "anti-jerk valve" or "damper"
http://www.peachparts.com/shopforum/diesel-discussion/272573-jerking-backlash-behavior-190d-manual-transmission.html

__________________
Spencer

87 2.5L 190D Turbo 5-speed - 102k (Daily Driver)
82 300D Turbo - 145k - Light Ivory (near mint)

Gone: 85 300D Federal - mileage unknown