Here's a general outline of the process. Specifics might vary slightly depending on the exact model and condition of your truck:
Tools You'll Need:
* Pitman arm puller: This is absolutely essential. A common type is a slide hammer puller specifically designed for pitman arms. Improvised methods are highly discouraged.
* Socket wrench: The size will depend on the nut securing the pitman arm to the steering box. Likely a 1 1/16" or similar.
* Wrench (optional but recommended): A second wrench to hold the steering box while you loosen the nut. This prevents the steering box from turning and potentially damaging it.
* Penetrating oil (like PB Blaster): Soak the nut and the connection generously well in advance to break loose any corrosion or rust. Let it sit for several hours, or even overnight.
* Hammer (optional): May be needed to lightly tap the puller or loosen stubborn parts.
* Torque wrench (for reinstallation): Crucial for reassembling to the correct specification to avoid damage or premature wear.
Procedure:
1. Safety First: Disconnect the battery negative terminal. This prevents accidental shorts and prevents the steering from moving unexpectedly. Chock the rear wheels to ensure the truck doesn't roll.
2. Preparation: Apply penetrating oil liberally to the pitman arm nut. Let it soak for several hours, or even overnight. This is crucial for loosening a potentially seized nut.
3. Loosen the Nut: Use the socket wrench (and potentially a second wrench to hold the steering box) to loosen and remove the nut securing the pitman arm to the steering box. Turn it counter-clockwise.
4. Attach the Puller: Carefully position the pitman arm puller according to the manufacturer's instructions. This will usually involve securing the puller's claws or jaws around the pitman arm. Ensure the puller is securely attached and properly aligned.
5. Remove the Pitman Arm: Use the puller to carefully remove the pitman arm. This may require several firm pulls and possibly some gentle tapping with a hammer (if necessary and only in the directions recommended by the puller manufacturer). Avoid using excessive force; you could damage the steering box.
6. Clean Up: Clean any debris or old grease from the steering box and the pitman arm threads.
Reinstallation (Important):
* Lubricate: Apply a thin layer of lubricant to the new pitman arm threads.
* Install: Carefully install the new pitman arm (if replacing) or reinstall the old one.
* Tighten Nut: Tighten the nut to the manufacturer's specified torque. This is critical. Use a torque wrench; over-tightening can damage the steering box.
* Reconnect Battery: Reconnect the battery negative terminal.
* Test: Carefully test the steering to ensure it's working properly and that the pitman arm is secure.
Important Considerations:
* Steering Box Damage: There's a risk of damaging the steering box during this process. If you encounter significant resistance or feel like you're forcing anything, stop and seek professional assistance.
* Specifics: This is a general guide. Consult a repair manual specific to your 1950 Chevy truck for detailed instructions and torque specifications. These manuals often have illustrations that will be far more helpful than a general written description.
* Professional Help: If you're unsure about any step of this process, it's best to take your truck to a qualified mechanic. The steering system is critical for safe operation.
Remember, safety is paramount. Work carefully and take your time. Improper removal or installation can lead to serious consequences.
