Manual rack and pinions are available in (7) ratios from 1-3/4" (slow) to 3" (fast).  Rack speed is measured in inches per turn.  If you turn the pinion (1) time the rack shaft will move between 1-3/4" (slow) and 3" (fast).  That number is stamped on the front of the housing next to the greese fitting.  The bracket on the right side rack eye makes it possible to add power.