Speedometer Drive Gear
Thread Starter
|
New User
Joined: Mar 2007
Posts: 16
Likes: 0
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
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
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
Likes: 74
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
Posts: 88,826
Likes: 787
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
Likes: 74
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
Thread Starter
|
New User
Joined: Mar 2007
Posts: 16
Likes: 0
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: 787
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.
Trending Topics
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
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
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Thread
Thread Starter
Forum
Replies
Last Post
flaboy1979
Clutch, Transmission, Differential, Axle & Transfer Case
3
Dec 22, 2013 06:12 PM
genscripter
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
3
Feb 6, 2013 04:18 PM
peterbilttrucker
1973 - 1979 F-100 & Larger F-Series Trucks
27
May 3, 2009 02:01 PM