Trunnions

[gjz30075]

....

I think they are made in opposing thread direction pairs for the reason that if both say RH threads then turning the Wheel in one direction would be much harder than the other because it would be lifting the whole weight of the front of the vehicle, the other way would have gravity assistance.......

It is not so much turning effort but getting the car to track straight and the wheels to not steer in one direction when the car is moving and the steering wheel only held lightly

cheers
Rohan