1973-1978 Buick Century Trunk Lock: A Comprehensive Guide
Struggling with a trunk that won't open or latch? This guide covers everything you need to know about replacing your trunk lock.
- Replacement is a simple DIY job requiring only basic hand tools, usually taking less than 30 minutes.
- New aftermarket locks will come with a new set of keys; your original keys will no longer work for the trunk.
- Ensure you are buying a lock for a sedan, not a station wagon, as the parts are different.
- Brands like ACDelco and Standard Ignition offer excellent quality, while budget brands provide a functional, lower-cost alternative.
Is Your Trunk Lock Failing? Common Symptoms
For a classic vehicle like the 1973-1978 Buick Century, problems with the trunk lock are common after decades of use. Wear and tear can cause the internal components to fail. Here are the signs of a bad trunk lock:
- Key Won't Turn: The key feels stuck and won't rotate in the cylinder. This can be due to worn tumblers or debris inside the lock.
- Key Spins Freely: The key turns without any resistance, but the trunk doesn't open. This often means the connection between the lock cylinder and the latch rod is broken.
- Trunk Won't Latch: The trunk lid pops back up after you try to close it. While this can be a latch issue, a damaged lock assembly can sometimes interfere with the latch's operation.
- Key is Hard to Insert or Remove: The lock cylinder's internal parts may be worn or misaligned, making it difficult to use the key.
Pro Tip: Check the Latch First
Before ordering a new lock, make sure the problem isn't the trunk latch mechanism itself. With the trunk open, use a screwdriver to manually push the latch into its closed position. Then, try to operate it with the key. If the latch moves, the lock is likely working, and the problem may be with the latch's alignment or the striker on the body.
Choosing the Right Aftermarket Trunk Lock
Original GM trunk locks for a vehicle of this age are no longer in production. Fortunately, the aftermarket offers several reliable options. The trunk lock for the Century was used across many GM vehicles from the 1970s, so parts are readily available. Here’s a breakdown of the typical brand tiers you'll find:
Brand Quality Tiers
- Premium Aftermarket (ACDelco, Standard Ignition): ACDelco is GM's official parts brand and is generally considered a top-tier choice, offering quality that is often equivalent to the original part. Standard Motor Products (SMP), or Standard Ignition, is another highly respected brand known for making durable parts that meet or exceed original specifications. For a critical, frequently used part like a lock, these brands are a solid investment.
- Standard Aftermarket (Replacement, various store brands): These are budget-friendly options that get the job done. While they may not have the same long-term durability or precise finish as premium brands, they are a perfectly acceptable solution for many owners. These locks will restore function and come with new keys.
Aftermarket Trunk Lock Cost
| Brand Tier | Estimated Price |
|---|---|
| Premium (ACDelco, Standard Ignition) | $20 - $32 |
| Standard (Replacement) | $14 - $20 |
Prices are estimates and may vary based on the retailer.
Installation Overview
Replacing the trunk lock on a 1973-1978 Century is a straightforward job that most DIYers can handle. The process generally involves removing a retaining clip from behind the lock inside the trunk, disconnecting the actuator rod, and pulling the old lock cylinder out. The new lock slides in, the rod is reconnected, and the clip is reinstalled. No special tools are required beyond basic hand tools like a screwdriver and pliers.
Frequently Asked Questions
Do new aftermarket trunk locks come with keys?
Yes, all new aftermarket trunk lock cylinders come with a new set of keys. You will not be able to use your original keys with the new lock. This means you will have one key for the ignition and doors, and a separate key for the trunk.
Can I get a new trunk lock that matches my original ignition key?
Yes, but it requires extra steps. You would need to take the new, uncoded lock cylinder and your original key to a locksmith. They can re-pin the new lock to match your existing key. This is generally more expensive than simply using the new keys provided.
Is the trunk lock the same for a Century sedan and a wagon?
No, they are different. The sedan has a trunk lock cylinder in the decklid. The station wagon has a lock in the tailgate, which is a different part number and design, often incorporating a switch for the power rear window. Be sure to order the correct part for your body style.
Were there any recalls for the trunk lock on the 1973-1978 Buick Century?
No, searches of the National Highway Traffic Safety Administration (NHTSA) database show no recalls specifically related to the trunk lock or latch mechanism for this vehicle generation.
Technical Specifications
The trunk lock for the 1973-1978 Buick Century is a mechanical, key-operated cylinder that actuates the trunk latch via a metal rod. It is a common GM part used across many A-body platform vehicles of the era. Aftermarket replacements are typically made of die-cast metal and include the lock cylinder, a new gasket, a retaining clip, and two keys.
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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.