How to Disassemble a GM Steering Column Safely

Disassembling a steering column requires precision, the right tools, and strict safety measures to avoid injury or damage to vehicle components. This guide provides a complete walkthrough for removing and breaking down common steering columns found in GM vehicles and similar models, drawing from practical automotive restoration techniques.

Essential Tools and Materials

Before starting, gather specialized tools to ensure smooth disassembly. Standard wrenches and screwdrivers won’t suffice for compressed springs or retaining clips.

• Steering wheel puller (essential for safe wheel removal)
• Lock plate compressor tool
• Snap ring pliers or handmade depressor bracket
• Torx bits (TX20, TX30)
• 13mm, 15mm, 22mm sockets and wrenches
• Phillips and flathead screwdrivers
• Vice grips for stubborn bolts
• Paper clip for buzzer switch

Organize these in a toolkit nearby. Replacement parts like snap rings, springs, and gaskets should be on hand for reassembly.

Safety Precautions and Preparation

Prioritize safety to prevent airbag deployment, spring ejections, or steering mechanism damage. Disconnect the battery negative terminal first to eliminate electrical risks, especially with horn contacts and switches. Work in a well-lit, stable environment with the vehicle securely on jack stands if partially elevated. Wear safety glasses, as springs under tension can launch parts forcefully.

Removing the Steering Column from the Vehicle

Extracting the column intact simplifies bench disassembly. Begin by accessing the underside dash area, removing any trim panels for visibility.

1. Locate and remove the U-joint bolt (typically 11mm). This secures the column to the steering shaft.
2. Unscrew two 15mm nuts and two 15mm bolts clamping the column bracket to the firewall or dash support.
3. Disconnect electrical connectors: turn signal (multi-pin), wiper switch, ignition switch (black/white two-part with tabs), high beam switch, and cruise control if present.
4. For automatics, release park lock cable via two small Phillips screws on the ignition housing.
5. Gently lower and maneuver the column out, avoiding stress on remaining wires.

Tilt or telescoping columns may require releasing the pivot lever first to reduce spring tension.

Steering Wheel and Horn Contact Removal

The steering wheel anchors the upper column assembly. Position the front wheels straight ahead for proper clock spring alignment.

Remove the horn button cover by releasing clips or screws. Extract the center 22mm nut, then attach a steering wheel puller. Tighten evenly until the wheel slides off the splines—never hammer directly on the shaft.

Next, address the horn contact assembly. Use the lock plate compressor to depress the plate, revealing a C-clip or snap ring at the shaft groove. Slide the clip off with pliers, then release pressure slowly to remove the plate, spring, and cancelling cam. Note the spring in the cam tower to prevent loss.

Turn Signal and Multifunction Switch Disassembly

These switches wrap around the column, secured by hidden screws. Rotate the turn signal lever left/right/up/down to access all three Phillips screws. Disconnect the wiring harness underneath.

Pull the turn signal stalk after removing its Phillips retaining screw, with wipers in off position. Slide the entire switch assembly downward and out. For wiper/washer switches, depress the pivot pin and extract similarly, threading wires through the column.

Ignition Lock Cylinder and Housing Extraction

Set the ignition to RUN position. Use a paper clip to release the key buzzer switch tabs. Remove the TX20 bolt securing the cylinder and withdraw it carefully.

Unscrew three TX30 screws from the ignition housing. As it separates, watch for the high beam actuator rod falling free—note its orientation for reassembly. Disconnect any remaining park lock cables.

Tilt and Telescoping Mechanism Breakdown

Tilt columns feature a complex spring-loaded pivot. Release the tilt lever to slacken the main spring. Punch out the sector shaft with a screwdriver, removing its retaining bolt and spring.

Depress the silver spring retainer cap (rectangular slot) with a screwdriver, twist 1/4 turn counterclockwise, and lift off. Extract the heavy tilt spring—handle with care due to tension. Support brackets and levers may now pivot freely for full separation.

Lower Column Shaft and Bearing Service

With upper components off, access the steering shaft from below. Remove any remaining snap rings, bearings, or bushings. For collapsible columns, note breakaway features designed for crash safety—avoid bending.

Clean the shaft thoroughly, inspecting for wear grooves. Upper and lower bearings often press-fit; use a bearing puller if replacing.

Common Issues and Troubleshooting

Disassembly reveals frequent problems like worn turn signal cams, loose tilt springs, or corroded ignition contacts.

• Stuck steering wheel: Apply penetrating oil, ensure puller bolts are parallel.
• Snap ring won’t release: Fabricate a depressor from metal bracket secured by the compressor nut.
• Tilt spring binds: Verify lever fully released; use padded vice for control.
• Electrical shorts: Inspect wiring insulation during reassembly.

Reassembly Best Practices

Reverse the process meticulously. Lubricate bearings and pivot points with high-temp grease. Torque fasteners to spec: steering nut 25-30 ft-lbs, U-joint bolt 18-22 ft-lbs. Test all functions (horn, signals, tilt) before reinstallation.

Align the cancelling cam precisely for self-centering. Reconnect battery last and cycle ignition to verify no warning lights.

FAQs

Do I need special tools for steering column disassembly?

Yes, a steering wheel puller and lock plate compressor are mandatory to avoid damage or injury.

Can I disassemble without removing the column from the car?

Partial disassembly is possible, but full breakdown requires vehicle removal for access.

How do I handle tilt column springs safely?

Always compress and retain before releasing; use padded supports to control release.

What if my column has airbags?

Modern columns with SRS require professional handling—disconnect clockspring carefully or seek certified service.

Advanced Tips for Restoration

For classic cars like 1970s GM models (e.g., Nova, Fiero), source OEM parts from salvage yards. Powder coat housings for durability. Bench-test switches before install. If rack-and-pinion equipped, fully extract the pinch bolt to clear splines.