What would be the correct tooth count for a speedometer gear, t85 overdrive trans with 410 gear ratio. This is an older t85 because it uses the 16 spline yoke, that is so hard to find. I put this trans in my 54 ranch wagon and need a gear, don't know where to start. I have seen repro gears on Ebay. Will the trans accept different tooth counts or do you have to get it right the first time.

tom in iowa

54 Merc wagon

54 sunvalley

You can switch the driven gears with no problem. If you didn't change the rear end ratio, then the original gear should be correct. This assumes that the drive gears inside the transmission have the same number of teeth in both transmissions.

John - "The Hoosier Hurricane"

Didn't you have to change the entire housing? I did when I put a T-85 in my '56. The speedo gear goes on top of the drive gear rather than on the bottom like a T-86. I need a gear too. Google speedometer gears & a whole lot of sites come up. I have the same problem with a 4:10 gear. I'm going to take a big leap & put a 23 tooth in mine. It came with a 19. My speedometer is 10 mph fast.

Doing Fords for 45 years. '56 Customline Victoria

E.J. in Havana FL

E.J. in Florida....please let me know where you got your 23 tooth speedometer gear. I need one for my '54 Ford Police Interceptor setup. I have a 22 tooth gear in the car now but the speedo is about 10 MPH too fast at 65 MPH. If anyone has a 23 tooth gear or knows where to find one please let me know. Thanks, Alan S. Freeman

The TBird suppliers have a limited selection of gears. Check CASCO

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

CASCO has 19 tooth through 22 tooth gears but no 23 tooth gears. Alan

Here's the website for speedometer gears........

http://www.transmissioncenter.org/Ford_Speedometer_Gears.htm

Doing Fords for 45 years. '56 Customline Victoria

E.J. in Havana FL

Thanks E.J. for the link but judging from their website it looks like the only style 23 tooth Ford gear is the post 1957 style. They do have the 1956 and earlier style but only up to 22 teeth. I will call them tomorrow just to make sure. Do you actually have a 23 tooth gear of the pre-1957 style? Alan

Dennis carpenter makes gears of various teeth and sells them to people like Casco for resale At a higher price then you can buy direct from Carpenter, so I would check with Dennis carpenter. Try a reducer from a 4 speed (Granny Geared) pick up and you get closer with less teeth.

312T85Bird

What?

I checked that website that Havava suggests and they list a 22 Tooth and call it "Very Rare" for $29.00 AND DENNIS CARPENTER MAKES THAT GEAR AND I BOUGHT IT FROM THEM FOR $10.00. I think that Carpenter is the best bet by far.




312T85Bird

What?