If you want to narrow down the problem, disconnect parts and try them separately. For example, to test the box, remove the drag link, then try steering back and forth. At that point, you could also try moving the wheels back and forth by hand (wheels in the air) and see if the steering knuckles are smooth or not. Good time to check for steering knuckle play, grasp tires at 6 and 12 o'clock and feel for any play there.

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Project: 4Crawler
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