1973-1979 Buick Century Door Lock Cylinder and Key Kit Guide
Having trouble with your classic Century's door locks? Here’s what you need to know before you buy a new kit.
- The only practical source for a new door lock kit is the aftermarket; new OEM parts are not available.
- Replacement is a straightforward DIY job that requires removing the door panel and a single retaining clip.
- You must save the small actuator arm from your old lock and transfer it to the new one.
- Standard Ignition is a common and reliable aftermarket brand for this part.
Signs of a Failing Door Lock
On a classic car like the 1973-1979 Buick Century, door locks fail from simple wear and tear. Decades of use can wear down the tumblers inside the cylinder or cause the internal parts to break. Here are the common symptoms:
- Key is Hard to Insert or Turn: If you feel a lot of resistance, or the key gets stuck, the tumblers inside the lock cylinder are likely worn or dirty.
- Lock Doesn't Engage: You can turn the key, but the door doesn't lock or unlock. This often means the small arm on the back of the cylinder has broken or the clip holding the connecting rod has failed.
- Key Won't Come Out: After turning the lock, if the key is stuck, it's a sign of internal wear or misalignment.
- Loose Lock Cylinder: If the entire lock cylinder wiggles in the door, the outer retaining clip may be broken, loose, or rusted away.
Security First
A failing door lock doesn't just make it hard to get into your car; it makes it easy for others to get in. A lock that doesn't engage properly leaves your vehicle vulnerable. Replacing a worn lock is a small but important step in securing your classic Buick.
Aftermarket vs. OEM Door Locks
For a vehicle from the 1970s, finding a "new" original equipment manufacturer (OEM) part from GM is nearly impossible. Your realistic options are a new aftermarket kit or a used OEM part from a salvage yard.
- New Aftermarket: This is the most common and practical choice. Brands like Standard Ignition (SMP) produce new lock cylinders that are made to fit your Century. They come with new keys and provide a fresh, unworn mechanism. Quality is generally reliable for this type of basic mechanical part.
- Used OEM: Pulling a lock from a donor car is possible, but you are getting a part that is just as old as the one you are replacing. It might work, but its lifespan is unknown. You would also need the key for that lock, or you would have to take it to a locksmith.
For reliability and ease of installation, a new aftermarket kit is the recommended path. It solves the problem with a new part and new keys, avoiding the uncertainties of used components.
Cost of Replacing a Door Lock Kit (1973-1979 Buick Century)
| Part Type | Part Cost | Notes |
|---|---|---|
| New Aftermarket Kit | $28 - $32 | Includes lock cylinder(s) and new keys. This is the most common option. |
| New Old Stock (NOS) OEM | $75+ (if found) | Extremely rare. A new part that has been sitting on a shelf for 40+ years. |
| Used OEM | $10 - $40 | Salvage yard part. Condition varies greatly. May not include a key. |
| Shop Labor | $100 - $175 | A mechanic can typically do this job in about an hour. |
Frequently Asked Questions
Is this a difficult part to replace myself?
No, it is a very feasible DIY job for most people. The process involves removing the interior door panel, reaching inside the door to release a clip, and swapping the lock cylinder. The most common challenge is the limited space inside the door. There are many video guides for similar 1970s GM cars that show the exact process.
Do I need any special tools?
Basic hand tools are all that's required: screwdrivers to remove the door panel, and possibly a pair of pliers. A pick tool can be helpful for removing the window crank handle clip. A small light to see inside the door is also recommended.
Do I have to re-key the new lock to match my old key?
No. The kits come with new keys that match the new lock cylinder. Since your Century likely has a separate key for the ignition, you will simply have a new, separate key for your doors. If you want one key for all locks, you would need to involve a locksmith.
What is the most common mistake when ordering?
The lock cylinders themselves are often the same for the driver and passenger side. However, the small actuator arm on the back must be installed in the correct orientation for each side. You will need to transfer this arm from your old lock to the new one, so be sure to note its position before taking it off.
Were there any recalls for the door locks on these cars?
No. Searches of the National Highway Traffic Safety Administration (NHTSA) database show no recalls related to the door locks for the 1973-1979 Buick Century.
Technical Specifications
Kit typically includes one or two door lock cylinders, gaskets, retaining clips, and a pair of matching keys. The actuator arm must be reused from the original lock.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.