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


Ben Hess
55 steel top Crown, 56 TBird
Collinsville, Oklahoma

The TBird parts suppliers, especially CASCO, has four different ones for a 55/56. I assume Carpenter, Macs would be similar.

54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

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.

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


Ben Hess
55 steel top Crown, 56 TBird
Collinsville, Oklahoma

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

56 Vic, B'Ville 200 MPH Club Member, So Cal.

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.

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.

54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

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.............

56 Vic, B'Ville 200 MPH Club Member, So Cal.

Your mileage accumulation could be reduced if somehow your speedometer cable came unhooked for a while. I didn't say that!

John - "The Hoosier Hurricane"

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.

Frank/Rebop

Bristol, In ( by Elkhart)