Replacing the Door Lock Kit on Your 1979-1981 Dodge St. Regis
If your key no longer works in the door, a new lock cylinder kit is the simple and effective solution for your classic Dodge.
- Original Mopar door lock kits for the St. Regis are no longer available; a new aftermarket kit is the best solution.
- The Standard Ignition brand is a reputable choice for this replacement part.
- Symptoms are purely mechanical, such as a key that is hard to turn or doesn't work at all.
- Replacing the door lock cylinders is a straightforward DIY task that requires removing the door panel.
Symptoms of a Failing Door Lock Kit
For a car like the St. Regis, the door lock cylinders have been exposed to the elements for over 40 years. Wear and tear is normal. Here are the signs that you need a new kit:
- Key is Difficult to Insert or Turn: If you have to jiggle the key or use force to get it to turn, the internal tumblers are likely worn or corroded.
- Key Turns but Nothing Happens: The key might spin freely in the lock without engaging the mechanism. This means the connection between the cylinder and the door latch rod is broken.
- Lock is Completely Seized: Dirt, rust, and grime can build up inside the cylinder, preventing the key from being inserted or turned at all. While sometimes a penetrating lubricant can help, a seized lock often needs to be replaced.
- Key Won't Come Out: Worn tumblers can get stuck on the key, trapping it in the lock cylinder.
Is it the Lock or the Latch?
If the door locks and unlocks properly using the inside lock button but not with the key, the problem is almost certainly the door lock cylinder or the rod connecting it. If neither the key nor the interior button works, you may have an issue with the main latch mechanism inside the door.
Choosing the Right Aftermarket Door Lock Kit
Finding original Mopar parts for a 1979-1981 St. Regis is nearly impossible. New Old Stock (NOS) parts are long gone, and relying on a used lock from a salvage yard means you're getting a part that's just as old as the one you're replacing. For a simple, mechanical part like this, a new aftermarket kit is the most practical and reliable choice.
Standard Ignition (Standard Motor Products) is a well-known brand that has been making quality replacement parts for decades. Their door lock kits are designed to be direct-fit replacements for the original equipment. Reviews for their lock products are generally positive, citing good quality and fit for a variety of vehicles. This makes them a trusted option for getting your door locks working again.
A Note on Keys
An aftermarket door lock kit will come with its own set of keys. These keys will not match your original ignition key. You will have one key for the doors and a separate key for the ignition, which was common for many vehicles of this era.
Estimated Replacement Costs
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Standard Ignition) | $22.82 |
| New OEM (Mopar) | Discontinued |
| Used OEM (Salvage Yard) | $10 - $30 |
| Shop Labor | $100 - $180 |
Frequently Asked Questions
Is this a difficult part to replace myself?
No, this is a very DIY-friendly job for most owners. The process involves removing the interior door panel, reaching inside the door to release a small retaining clip, and swapping out the old cylinder for the new one. Basic hand tools are all that's required.
What comes in a typical door lock kit?
A standard kit includes two new door lock cylinders (one for each front door), a new set of matching keys, and the retaining clips needed to secure the cylinders to the door shell.
Are there any recalls or technical bulletins for St. Regis door locks?
No. Searches of the NHTSA database and other resources show no recalls or Technical Service Bulletins (TSBs) specifically related to the door lock cylinders on the 1979-1981 Dodge St. Regis.
Can I have the new locks re-keyed to match my ignition?
In most cases, it is not practical or cost-effective to re-key a new aftermarket door lock cylinder to match an old ignition key. It's much simpler to carry the two separate keys, one for the doors and one for the ignition.
Technical Specifications
Kit typically includes two (2) front door lock cylinders, two (2) matching keys, and retaining clips.
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.