I do not think they should be changed. If there is a broken tooth (common) in the gear box, the whole system can be off by that tooth. I believe the gear box is your real issue. 4" of toe in is not operational, and is about what I would expect from a tooth that was either worn or broken. These steering systems 300U and 350U are the single weak point on the tractor. (opinion) The spindle bushings and thrust bearing must be near perfect. The drag link ball ends must be tight and near zero play. the steering box should have the arms move in opposite directions at the moment the wheel is turned, (less than 1" of play). (dreaming on an old machine) The cam pin following the spiral groove in the worm gets worn as does the groove. The gears are over stressed, and wear, and there is no way to adjust backlash in the box. If it were mine, I would remove the tie rod from the pitman arm on the box, and measure the free travel and total travel of each arm (left-right) to assure they are the same. if there is a difference in looseness, there is going to be a need to repair the box. if there is a difference in travel, it may be broken internally. Gears can be repaired (expensive) New, or NOS, seem to be non-existent. if the left side seems good, a drag link could be made to transfer the steering from side to side, then power steering linkage type (early mustang, or ford car from 1955 to 1962 could be adapted. Several companies make kits to replace the system with power steering. Jackson Power Steering is one. Best of luck and keep us informed, Jim
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