if the steering is binding up on full lock then it could be an issue with a suspension joint or steering knuckle thats seizing up
So I'd suggest to jack the car up so the front wheels are off the ground and then move the road wheel from lock to lock by hand and shake the wheel from side to side at the extremes of movement and in the middle to try and find any play in the joints
and also try spraying the steering column universal joint with some penetrating oil to see if this effects anything
if it does then replace that joint
To feel if there's a worn strut top bearing then lightly hold the spring by hand and have your assistant move the steering from left to right with the wheel on the ground - a worn bearing will feel 'notchy' through the spring. The wheel needs to be on the ground for the test to load up the bearing
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