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Unless the tumblers are worn out and you can get another key to work the only way to get the lock cylinder out is drilling from what I have seen. If I remember right you can't even remove the whole ignition switch from the dash without getting the tumbler out first as the bezel will not go over the cylinder.

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You can actually remove the ignition round bolt. You have to keep loosening it and it will come out, may teat up the round part of the cylider a bit but you’re changing that anyway. Once thats off just unplug the harness

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I lost my keys to 66 ss, and trying to replace the lock cylinder. Is there anyway I can do it without the keys, I’ve seen where you have to have them.
The paper clip goes in but don’t want to mess it up.
Any help would be great!
Kenny W.
Hey , Kwilk1734.

Unfortunately I had the same situation before. Here is some useful information that’s helped me save a lot of time and money. Hope it will help you as well:

Hopefully, you wont need any service ;)

I guess there is a huge difference between different keys, models, etc.
Also locksmiths and dealers charge different amounts for the very same key.
It helped me save a lot of money (more than $150).

Generally speaking, to get a replacement key, you have three options:
1.Call an automotive locksmith that offers a mobile service for cars. Here is a phone number for a company that have many different locations and locksmiths: 800-223-1453. I think they work all around the US but not sure. Give them a call and ask.
2.Tow the car to the dealer.
3.Order a key online and have the dealer or locksmith cut and program it for you (if necessary).

If you do call a locksmith or the dealer, don’t forget to mention some important information so they will check if they have the key blank and the necessary tools to code you the new key:
1.Year, make and model of the car
2.Your exact location including street address and zip (for the locksmith to find you easily)
3.VIN number of the car located on the dashboard – very important
4.Make sure you can show them proof of ownership – otherwise they will not make you a new replacement key.

Regarding the cost, it really depends on the type of key you had.
There are 3 main types of keys:
Non-chip keys: for older models (mostly 2000 and older)
Transponder chip keys – these types of keys must be coded on site with a special machine, otherwise the car wont start. These are more expensive to make
Key fob – push to start – these are the most expensive types of keys. Mostly made for models made after 2015.
The average cost is somewhere between $200-$460. It also depends on your location, time of day, weekend, etc etc.
Here is the link for some additional information:

good luck!
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