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By crown55vic - 12 Years Ago
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Anyone know of a source for speedometer drive gears for 55 Ford? Also, how many teeth are on the gear for 4:11 rear end?
Thanks,
Ben,
Tulsa, OK
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By paul2748 - 12 Years Ago
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The TBird parts suppliers, especially CASCO, has four different ones for a 55/56. I assume Carpenter, Macs would be similar.
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By Hutz 292 - 12 Years Ago
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I am a part of ATRA (Automatic Transmissions Rebuilders Association) and we have a speedometer gear calculator. All I need is the tire size, rear end gear ratio and either the drive gear tooth count or the driven tooth count and it will calculate what tooth count you need to make speedo accurate. Just let me know if you need anything like that.
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By crown55vic - 12 Years Ago
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Thanks for the replies Paul and Hutz. Carpenter and Macs don't list the speedo gear. Will check into CASCO. Hutz, when I get a tooth count on the gear I will let you know.
Thanks again.
Ben
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By DryLakesRacer - 11 Years Ago
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Concours Parts lists speedo gears in their catalog. A little confusing 3:31 gear 19 teeth, then 3:92 gear with OD trans 20 teeth , followed with a 22 teeth 312 T-85 o.d. 3:92 .......All around $22 ...Good Luck
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By skygazer - 11 Years Ago
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DryLakesRacer (2/27/2013)
C... 3:31 gear 19 teeth...
The t-bird 150mph speedometers are famously optimistic. My stock '55 bird (stock FoM, 3:31 rear) indicated about 20% high, compared to GPS/iPhone. When my speedo cable gear broke, I replaced it with a 22 tooth. Now it reads just a little higher than GPS, within normally acceptable tolerance.
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By paul2748 - 11 Years Ago
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Another source of the driven gears (the ones on the cable) is AutoKrafters www.autokrafters.com or 1-800-228-7346 or Dearborn Classics www.dearbornclassics.com. 1-800-252-7427. Dearborn has both left and right tilt.
Another source is ebay - put in Ford speedometer gear. That is where I got mine.
To distinguish right or left tile, look at the gear - if the top is to the right its a right tilt, vice versa left tilt.
Added 3/1 - The above is true if you look at the gear in a vertical position. However, it is opposite hat if you look at it in a horizontal position - so now I don't know which way they distinguish left and right.
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By DryLakesRacer - 11 Years Ago
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Skygazer...Just got back to the post. My speedo reads fast, at least 5% Ihave a 3.31 gear and guessed the speedo gear was off. Going to buy a22 tooth the next time I order from a Catalogue Co. I would like it to run slow since I have yearly "restriction" on my Classic Car insuance. . Thanks for you info.............
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By Hoosier Hurricane - 11 Years Ago
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Your mileage accumulation could be reduced if somehow your speedometer cable came unhooked for a while. I didn't say that!
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By pegleg - 11 Years Ago
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The other possibility, that nobody knows about, would be to run the odometer back wards with a drill. I would never do that but I heard it could be done.
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By paul2748 - 11 Years Ago
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Because on an inaccurate speedo in my 64 Fairlane and 56 Bird, I experimented with different driven gears using my GPS. Each tooth difference accounts for about 5 MPH at around 60MPH.
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By ejstith - 11 Years Ago
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I need one too since I put a T-85 overdrive in my '56. Tee-bird products has some I think. I got my cable & housing there. I'm going to try a 23. Mine is 10 mph off. If you google "speedometer gear" there are dozens of places that come up....
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By ian57tbird - 11 Years Ago
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I thought most old cars had optimistic speedos. Mine reads about 8% high against a GPS. I didn't think odometers could run backwards. Easy test, drive backwards for a couple of hundred feet and see if it moves.
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By Hoosier Hurricane - 11 Years Ago
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Ian:
The older mechanical odometers will run backwards. An old used car lot trick was to hook an electric drill to an old piece of cable core and remove some of the mileage from the odometer. The new electric odometers read "forward" regardless of direction of rotation as they read magnetic pulses.
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