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> As for rack over constraining ...

The worst cases I've seen are often with a short rack (junior dragster?) that is extended, and then additional bushings are added to support the longer rack...

Good discussion!

In design judging, I've often used a quick test that someone told me was the "Carroll Smith steering friction test". With the front tires lifted off the ground, move the steering...

Seems to me you are asking the wrong questions(?)

Whenever I've design judged, one of the most common problems is a steering system with far, far too much friction to allow precise steering by the...