Joints that connect sections of the steering column.
Steering shaft joints transmit wheel input around obstacles in the engine bay. Wear can cause notchy feel, free play or knock noises near the firewall. Match spline size, coupling style and length. Check for binding through the full steering range after fitting. Correct steering joints help keep steering feel accurate and smooth.
Worn or dry steering joints can cause notchy feedback and tight spots.
Yes. Wear at the firewall or lower joint often presents as a cabin knock.
The joint itself does not change alignment, but any steering work is a good time to confirm settings.