Speedometer Drive Gear
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Speedometer Drive Gear
Hello, I Have A '61 F100, 223, With A Three Speed Column Shift. I'm In Need Of The Speedometer Drive Gear, The Plastic Worm Gear That Fits Over The Tailshaft. I'm Not Sure What Year The Tranny Is. It Has A Synchromesh First Gear, And I Have These Numbers Off The Housing. On The Right Side Tailshaft Housing: C3tr-7a040, And On The Left Side Gearbox Housing: C3ah7006. I Appreciate Any Info. Regarding Year, And Drive Gear Source. Thanks, John
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From: Simi Valley, CA
Originally Posted by FLOJ0620
Hello, I Have A '61 F100, 223, With A Three Speed Column Shift. I'm In Need Of The Speedometer Drive Gear, The Plastic Worm Gear That Fits Over The Tailshaft. I'm Not Sure What Year The Tranny Is. It Has A Synchromesh First Gear, And I Have These Numbers Off The Housing. On The Right Side Tailshaft Housing: C3tr-7a040, And On The Left Side Gearbox Housing: C3ah7006. I Appreciate Any Info. Regarding Year, And Drive Gear Source. Thanks, John
Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
FLOJ0620, Welcome to the 61-66 forum 
Since you have a sincro 1st, I believe the tranny has been replaced. Bill should be able to confirm.
You will need to go under the truck and actually pull the cable. You will need to take a 3/8 wrench with you. Once pulled hold it vertically and take notice if the top of the threads lean left or right. Manual gears lean left or left twist, if my memory is working. Then count the number of teeth on the gear.
I have seen some sites that had calculators for figuring the number out if you don't have the gear.
Good luck
John
Since you have a sincro 1st, I believe the tranny has been replaced. Bill should be able to confirm.
You will need to go under the truck and actually pull the cable. You will need to take a 3/8 wrench with you. Once pulled hold it vertically and take notice if the top of the threads lean left or right. Manual gears lean left or left twist, if my memory is working. Then count the number of teeth on the gear.
I have seen some sites that had calculators for figuring the number out if you don't have the gear.
Good luck
John
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Transmission has been updated to the Ford 3.03. Regardless, the rear end ratio is still needed to figure the drive gear, which OP needs, not the driven gear. The driven gear is a piece of cake..just count the teeth. It'll be normal rotation: ///.
OP: Post the axle code from the VIN plate.
There's three different drive gears listed.
OP: Post the axle code from the VIN plate.
There's three different drive gears listed.
Last edited by NumberDummy; Mar 31, 2007 at 08:01 AM.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
Bill, Check your book bro, I could be wrong and would stand corrected, but I think the manual tranny gears are like this \\\ and the auto trannys ///
At least that is the way I learned it.
John
At least that is the way I learned it.
John
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Hello Again, Thanks To Everyone Who Responded To My Query. The Vin Code For The Axle Is 12, If Someone Knows What The Rear End Ratio Would Be. Is It True That The Ratio Is The Number Of Revolutions Of The Driveshaft, To One Revolution Of The Rear Wheel? I Had Jacked The Rear End, And Turned The Drive Shaft By Hand. It Only Turned 1 And 3/4 Revolutions To One Rev. Of The Drive Wheel. If This Is Wrong, Please Advise. Thanks, John
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
Originally Posted by FLOJ0620
Hello Again, Thanks To Everyone Who Responded To My Query. The Vin Code For The Axle Is 12, If Someone Knows What The Rear End Ratio Would Be. Is It True That The Ratio Is The Number Of Revolutions Of The Driveshaft, To One Revolution Of The Rear Wheel? I Had Jacked The Rear End, And Turned The Drive Shaft By Hand. It Only Turned 1 And 3/4 Revolutions To One Rev. Of The Drive Wheel. If This Is Wrong, Please Advise. Thanks, John
D0TZ-17285-A .. Speedo Drive Gear 6 teeth~on output shaft
C0DD-17271-B .. Speedo Driven Gear 18 teeth
--------------------------------------------
gee wilikers jowilker, check the book? LOL Don't need to buddy. I'm blessed (or cursed..it depends) with a photographic memory. Some 4 speed's like Dagenhams and a few other truck 4 speeds use \\\...but most are.../// including this one.
Last edited by NumberDummy; Mar 31, 2007 at 11:06 PM.
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Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
Originally Posted by NumberDummy
gee wilikers jowilker, check the book? LOL Don't need to buddy. I'm blessed (or cursed..it depends) with a photographic memory. Some 4 speed's like Dagenhams and a few other truck 4 speeds use
John
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