Steering box & Linkages

A steering box would most commonly be found in heavy duty vehicles and SUVs.  They are similar to steering racks, but use a worm gear.

1. sector shaft cover

2. adjusting screw 

3. gasket

4. sector shaft 

5. bearing 

6. plug

7. plug 

8. seal 

9. bearing

10. housing 

11. bearing cup 

12. balls and cage

13. ball nut 

14. ball-return guides 

15. retainer

16. balls

17. input or mainshaft 

18. balls and cage

19. bearing cup 

20. input shaft bearing adjuster

21. seal 

22. locknut

The column is connected to a worn gear (input shaft), as the worm gear turns, it turns a sector shaft.  This sector shaft has a lever (drop arm) which then turns the steering rods and tie rods.