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Unless you've had a recirculating ball-type steering box apart, it might be kind of hard to visualize what's going on inside. In this diagram, you can see how the worm gear works on the block (called the ball nut rack here) through the ball bearings. The block then acts on a sector gear attached to the pitman arm. Trouble arises when the ball bearings and the spiral channel wear out, creating excessive clearance. View Related Article
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