1970-1972 Buick GS 455 Trunk Lock: Replacement and Upgrade Guide
If your trunk key is sticking or the lock is broken, a new lock cylinder is an easy and essential fix for your classic GS 455.
- Replacing the trunk lock cylinder is a simple, beginner-friendly DIY task that takes less than 30 minutes.
- A new aftermarket lock from a brand like Standard Ignition is the most reliable and affordable option, as new OEM parts are unavailable.
- The new lock will come with new keys. A locksmith can re-key the new cylinder to match your car's original keys if desired.
- No recalls or TSBs are active for this part; failures are due to normal age and wear.
Is Your Trunk Lock Failing?
After more than 50 years of use, the trunk lock on a classic 1970-1972 Buick GS 455 can wear out. Exposure to weather and decades of use can cause the internal pins to stick or the mechanism to fail. If you're having trouble opening your trunk or the key feels stiff, the lock cylinder is the most likely culprit.
Common Symptoms of a Bad Trunk Lock
- Key is Hard to Turn or Won't Go In: The tumblers inside the lock can get worn or gummed up with dirt, making it difficult to use the key.
- Lock Feels Loose or Spins Freely: The retaining clip holding the lock in the trunk lid can become loose or break, causing the entire assembly to move.
- Key Turns But Nothing Happens: This often means the small lever on the back of the lock cylinder has broken or the rod connecting it to the latch has disconnected.
- Trunk Won't Lock: The mechanism fails to engage, leaving your trunk contents unsecured.
No Recalls or Service Bulletins Found
Searches of the National Highway Traffic Safety Administration (NHTSA) database and for General Motors Technical Service Bulletins (TSBs) did not find any specific recalls or bulletins related to the trunk lock for the 1970-1972 Buick GS 455. This is normal for a vehicle of this age, with failures typically resulting from standard wear and tear.
Choosing the Right Aftermarket Trunk Lock
For a classic muscle car like the GS 455, finding a New Old Stock (NOS) GM trunk lock is nearly impossible and would be very expensive. While used original locks can be found, they are just as old as the part you are replacing and may have significant wear. A new aftermarket lock is the most reliable and cost-effective solution.
Brand Spotlight: Standard Ignition
Standard Ignition (also known as Standard Motor Products or SMP) is a well-established brand trusted by professional mechanics for over 100 years. They produce high-quality replacement parts that are designed to meet or exceed original equipment specifications. Their lock cylinders are known for quality construction, often using brass tumblers and die-cast zinc cores for durability and smooth operation. For the 1970-1972 GS 455, Standard Ignition offers trunk locks in both the original style black and chrome finishes.
Pro Tip: Re-Key Your New Lock
Your new aftermarket trunk lock will come with a new set of keys. If you want to avoid carrying an extra key for your car, a locksmith can easily re-key the new lock cylinder to match your original ignition and door keys. This is a common practice for classic car owners.
Cost of Replacing a Trunk Lock on a 1970-1972 Buick GS 455
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Standard Ignition) | $14.75 - $16.28 |
| Used OEM | $30 - $80 |
| Shop Labor | $50 - $100 |
Frequently Asked Questions (FAQ)
Is replacing the trunk lock a difficult job?
No, this is a very easy job that is perfect for a beginner. It usually takes less than 30 minutes and only requires basic hand tools like pliers and a screwdriver to remove a retaining clip from inside the trunk.
Will my original key work with the new lock?
No, the new lock cylinder will come with its own set of keys. Your original key will not work unless you have a locksmith re-key the new lock to match your old one.
What's the difference between the lock cylinder and the latch assembly?
The lock cylinder is the part you put the key into. The latch is the larger mechanism inside the trunk that holds the lid shut. This article focuses on the lock cylinder, which is the most common failure point.
Should I choose a black or chrome finish lock?
This is purely a cosmetic choice. Both black and chrome finish locks were available. Choose the one that matches your car's original trim or your personal preference. The function is identical.
Technical Specifications
The trunk lock is a mechanical cylinder lock. Aftermarket replacements from Standard Ignition are available in both black and chrome finishes.
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.