the steering gear includes a housing ,a worm ,a ball nut ,a rack made integral with the piston ,a hydrulic booster,and a toothed sector integrated with the pitman arm shaft.
a higher torque should be applied to the wheels to set an automobile in motion or move uphill with a full load than to keep it rolling after it gets under way on level stretches of the road, when inertia is high and tractive resistance is low