* The Shaft: This is the main, central part, running from the steering wheel to the gear box under the dash. It's usually a tubular design, and may have some internal components like the clockspring (for airbag deployment and electrical connections to the steering wheel).
* Steering Wheel Connection: At the top, it connects to the steering wheel via a bolt or spline connection.
* Steering Gear Connection: At the bottom, it connects to the steering gearbox (under the dash) via a universal joint or similar mechanism allowing for some flexibility in the steering.
* Column Shifter (if applicable): If your truck had a column-mounted automatic transmission shifter, part of the column will incorporate the shifter mechanism and linkage.
* Turn Signal and Wiper Switch Stalk: These are usually mounted on the column, and often integrated as part of the column's housing.
* Ignition Switch: Often a cylindrical component on the column, usually near the steering wheel.
* Column Housing/Shroud: The entire column is generally covered by a plastic or metal shroud for protection and aesthetics. This shroud might have different appearance options depending on the trim level of your Sierra.
Visual Reference: Searching "1989 GMC Sierra steering column" on Google Images will give you the best visual representation. Pay close attention to the year and model to ensure accuracy as there might be slight variations. You'll see the general shape and features described above. However, a picture will be much more informative than a written description.
