Make An Object, Pivot towards another Object

Hi All. I'm setting up some vehicle physics, Everything is going great except I need to make the wheels Axel follow the Wheel. This is a picture hopefully giving more information on what i want.

So "This Object" is the Wheels Axel / Suspension, I need it to rotate on its Z Axis To follow the wheels Y Axis. I have tryed.

 gameObject.transform.rotation.z = target.localPosition.y;

This causes issues with it following too low / high, So i created a var

 var minus : float;
 
 gameObject.transform.rotation.z = -target.localPosition.y -minus;

This fixes the issue with low / high, But it still doesn't work, When i turn the axis are like flipped & Screws it up completely, I'm hoping someone on this wonderfull forum, Could give me some friendly advice / Point in the right direction To Get this working correctly, Thanks for your time.