Wbrian63 from the W116 forum said:

"The rocking motion is likely related to the worn box. There's a valve in the steering box that provides pressure to whatever side of the steering system needs to boost the turning exercise. If the box is worn, then the parts are probably wobbling around inside, which is confusing the valve as to which direction the boost needs to come from."

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles