I don't know about manual steering, but my PS rack, had a tensioner--slack
taker upper on the pinion. I once tightened this to take up any slack that
may exist, but I overtightened. It is a a rather sensitive adjustment. This
over tightening caused significant, extra steering effort(PS belt
removed)lock to lock. Also, the steering wheel would not return to center
after turning a corner. Perhaps your old rack has a wear issue, and
something is hanging-up inside, in certain positions?

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