Discuss 66 mustang speedometer cable lock on AllFordMustangs.com, the place for Mustang enthusiasts.
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Never heard of or seen a security lock on a speedo cable on a 66 Stang . Is it on the transmission end or the under the dash? In any case, by any means necessary, cut the cable if it is the only way(since you are going to replace the cable anyway).
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1966 Mustang Vert., 200 CID I6, Autolite 1100, Candy Apple Red, black interior with black power top, C4 Auto Trans (was 3 speed manual), Scarebird 4 lug front disc brake conversion, dual MC in process.
1976 Cobra II, 302 CID, C4 auto trans. Blackjack headers, white with blue stripe and blue interior. Restoration and mod in process.
There is no lock on it. All cars with the C4 use the same speedo cable, and I just replaced mine. The only thing that should be holding the cable into the transmission casing, is a clamp that is held in place by a bolt.
If you're talking about where it attaches to the speedo head in the cluster, it should work with the older style threaded end. The teeth on the newer style clip grips onto the threads of the older design. You just squeeze the tabs together and slip it on over the threads. Try it before you go cutting anything. It should work if it's what I'm thinking of.
Hello, I just checked your post that had the links attached, they did not link to the pics for some reason, if you could upload the pics as attachments that would be great! Thanks!!
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Hello. There isn't a lock on the speedo cable of a 66, and there really isn't any sensible way for someone to rig one up. The cable just unscrews from the back of the speedo. There are, however, two screws, as shown in the picture, which could be mistaken for a locking mechanism of some sort. They are what attaches the speedometer itself to the instrument cluster.
I just replaced my speedo cable and mine just unscrews from the back of the speedometer. Even the new cable didn't come with any locking device. Are you talking about where the cable attaches to the speedometer or at the transmission?
Hi again. I don't know what to tell you on that one, other than people sure do some funny things to their Mustangs. I can't imagine what benefit the dreaded Previous Owner thought would be derived from this, but he sure went to an awful lot of trouble. Yeah, that drill it out thing sounds like your best bet, assuming that he didn't have it keyed for the ignition or door lock key. I think that I'd try that first. You might get lucky. Be careful not to mess up the threads where the speedo cable screws back on.
It looks like this lock was there to prevent milage tampering. This is a new one for me. I've never seen anything like this on a Mustang. When you said a lock, you weren't joking.
Can you cut the potmetal housing off with a cutting wheel? It may be easier to do this.
I cut the cable and pulled the whole cluster out. I tried drilling it out with no luck. I was able to push some pliers down one side and rotate the whole lock against the nut to get it off. The lock was made by T&A Manuf. in St. Paul, MN. Not sure of a timeline only that the business that made the lock is no longer in business.
definitely not a Hertz model. I have the original Owners Manual and buyers name. most likely it was a trade in and a used car dealer did it somewhere along the way. The codes on the block indicate a regular C-code and match the #'s on the car.
That's a new one on me too. Never seen or heard anything like that before!
I had been thinking a rental or company car but with an individual for original owner I see why those ideas are out. Interesting lock though and seems to be specifically made for that purpose.
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1968 Mustang coupe, Acapulco Blue, 289 2v, C-4, Power Steering.
Hopefully a 1969 convertible or Sportsroof (non Mach or Boss) for next Mustang project
Trying to find my father's 1973 Mustang Grande he bought brand new. 3F04F126773 last known registration and title was in New Jersey, 1982.
66 mustang speedometer cable lock 
. Is it on the transmission end or the under the dash? In any case, by any means necessary, cut the cable if it is the only way(since you are going to replace the cable anyway).
There isn't a lock on the speedo cable of a 66, and there really isn't any sensible way for someone to rig one up. The cable just unscrews from the back of the speedo. There are, however, two screws, as shown in the picture, which could be mistaken for a locking mechanism of some sort. They are what attaches the speedometer itself to the instrument cluster.
