Reversing the steering system with wheels off the ground by moving them from side to side always seems to thow up small variations in stiffness through the lock to lock range. On my 53 year old Land Rover with a steering box there is also a friction damper in the linkage to contend with. On my Roadster the mechanical effects of electric assistance on the column may be a cause, or just the rack and pinion working in reverse. In any/either case I would only worry if excessive.
ETA: Heinz also mentions steering joints. Individual universal joints do exhibit angular acceleration/deceleration when transmitting a turning force through an angle (hence adoption of CV joints on FWD vehicles) which may also contribute to the observed effect.
Last edited by Richard Wood; 03/12/19 08:36 PM.
