1966-1971 Chrysler 300 Door Lock Kit and Cylinder Guide
If your key is stuck or the door won't lock, this guide is for you.
- The problem is often the internal latch mechanism, not just the lock cylinder. Always diagnose by cleaning and lubricating the latch first.
- The only new parts available are aftermarket kits from brands like Standard Ignition.
- Replacing the door lock cylinder means you will have a separate key for your doors and ignition.
- This is a manageable DIY project for those comfortable with removing door panels and working with small clips and rods.
Is Your 1966-1971 Chrysler 300 Door Lock Failing?
On a classic car like the 1966-1971 Chrysler 300, door lock problems are common. After 50+ years, the internal parts can wear out, get gummed up, or simply freeze from lack of use. Often, the issue isn't the key cylinder itself, but the latch mechanism it connects to inside the door. You might find the key turns but nothing happens, or the inside lock knob feels loose and ineffective.
Common Ordering Mistake
Be aware that this kit replaces only the door lock cylinders and keys. It does not include the larger internal door latch assembly, which is often the actual source of locking problems. Always diagnose the issue before ordering parts. Sometimes, simply removing, cleaning, and lubricating the original latch mechanism can solve the problem.
Symptoms of a Failing Door Lock System
- Key Won't Turn: The lock cylinder may be seized from dirt, corrosion, or lack of use.
- Lock Doesn't Engage: The key turns, but the door doesn't lock or unlock. This usually points to a problem with the connecting rod or the internal latch mechanism.
- Inside Knob is Loose: The knob on the inside of the door moves but doesn't lock the door, indicating a disconnected or broken linkage.
- Door Unlocks Itself: On some classic Mopars, a worn mechanism or a specific safety feature could cause the lock button to pop up when the door is closed or the handle is pushed.
Choosing an Aftermarket Door Lock Kit
For a vehicle of this age, finding New Old Stock (NOS) OEM parts is nearly impossible. The market primarily consists of used parts from donor cars or new aftermarket kits.
Standard Ignition is the main brand available for a new aftermarket door lock kit. They are a well-known company in the aftermarket industry with a reputation for producing quality replacement parts that meet or exceed original specifications. Their kits for classic cars typically use durable materials like brass tumblers and die-cast zinc cores. While fitment is generally good, it's always wise to compare the new part to your original before installation.
A Note on Keys
Original Chrysler vehicles often used one key for the doors and ignition. An aftermarket door lock kit will come with its own set of keys that will not match your original ignition key. You will have to carry two separate keys after installation.
New Aftermarket Door Lock Kit Cost for 1966-1971 Chrysler 300
| Part Type | Price Range |
|---|---|
| New Aftermarket Door Lock Kit (Standard Ignition) | $22.82 - $22.82 |
| Shop Labor to Install | $90 - $180 |
Frequently Asked Questions
Will this kit fix my power locks?
No. This is a mechanical kit for the key cylinder. If your car has the optional power locks and they are failing, the problem is likely an old solenoid, relay, or wiring. This kit will not solve electrical issues.
Is replacing a door lock cylinder a DIY job?
Yes, for someone with basic mechanical skills. The job requires removing the inner door panel and carefully detaching small clips and rods in a tight space. An impact screwdriver might be needed to remove old latch screws.
Why won't my driver's door lock from the inside button?
Some Chrysler models from this era had a feature to prevent you from locking your keys in the car. The driver's door could only be locked from the outside with the key. This may not be a sign of a broken part.
What if I replace the cylinder and the lock still doesn't work?
The problem is almost certainly in the main latch mechanism inside the door. You will need to remove the entire assembly for cleaning, lubrication, or replacement with a used part if it's broken.
Technical Specifications
Fits 1966-1971 Chrysler 300. Kit includes two door lock cylinders and two matching keys.
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.