Notices
1948 - 1956 F1, F100 & Larger F-Series Trucks Discuss the Fat Fendered and Classic Ford Trucks

C6 Speedometer gear question???

Thread Tools
 
Search this Thread
 
Old May 18, 2011 | 11:18 PM
  #1  
Rawkauf's Avatar
Rawkauf
Thread Starter
|
New User
Joined: Apr 2011
Posts: 1
Likes: 0
C6 Speedometer gear question???

I recently purchased a 1958 F100 with a 1970 351C and C6 trans. I installed a speedometer cable in place of the broken one. The speedometer works well but is reading about 20 mph too fast (80) at approx 60 mph. The current gear is 16 tooth blue/green plastic and is about 2 inches long. I ordered a replacement 20 gear black plastic gear and it is only approx. 1 inch long. It does not work, the gear seems not to make contact. Any ideas? Thanks
 
Reply
Old May 19, 2011 | 03:00 AM
  #2  
superman64011's Avatar
superman64011
Tuned
20 Year Member
Joined: Feb 2004
Posts: 339
Likes: 1
Not sure what gear ratio on mine is but mine is about 5 mph off and mine is an orangish color. Someone will post soon with a better answer
 
Reply
Old May 19, 2011 | 05:52 AM
  #3  
sdetweil's Avatar
sdetweil
Hotshot
25 Year Member
Photogenic
Photoriffic
Shutterbug
Joined: Nov 2000
Posts: 11,591
Likes: 14
From: Pflugerville, tx
Club FTE Silver Member

sounds like the gear isn't seated completely..

the contact point is up high on the gear, close to the cable.

Sam
 
Attached Images  
Reply
Old May 19, 2011 | 10:56 AM
  #4  
NumberDummy's Avatar
NumberDummy
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
Club FTE Gold Member
The correct 20T driven speedo gear is: C8SZ-17271-B / Orange / Available from Ford / MSRP: $3.75 // FTE sponsor PARTSGUYED.COM price: $2.70.

IMO, a 20T gear is one tooth too many for a speedo that is reading 20 MPH fast.

C7VY-17271-A .. 19T Driven Speedo Gear / Tan / Available from Ford / MSRP: $2.98 // PARTSGUYED.COM price: $2.15.
 
Reply
Old May 19, 2011 | 03:55 PM
  #5  
sdetweil's Avatar
sdetweil
Hotshot
25 Year Member
Photogenic
Photoriffic
Shutterbug
Joined: Nov 2000
Posts: 11,591
Likes: 14
From: Pflugerville, tx
Club FTE Silver Member

here's a good calculator

Speedometer Gear Calculator

Sam
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
jbwilli
Explorer, Sport Trac, Mountaineer & Aviator
7
Jun 3, 2023 10:38 PM
88_F0RD
1987 - 1996 F150 & Larger F-Series Trucks
15
Dec 4, 2016 12:45 PM
hivoltj
1973 - 1979 F-100 & Larger F-Series Trucks
5
Mar 17, 2016 09:47 PM
mikedepalma
1987 - 1996 F150 & Larger F-Series Trucks
5
Feb 18, 2016 10:54 AM
mekanikman_402
1997 - 2003 F150
6
Apr 21, 2012 03:02 PM




All times are GMT -5. The time now is 08:42 AM.

story-0
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.

By Verdad Gallardo | 2026-06-12 11:01:55


VIEW MORE
story-1
Top 10 Fords at 2026 Carlisle Ford Nationals

Slideshow: Top 10 Fords at 2026 Ford Nationals

By Joe Kucinski | 2026-06-09 11:10:08


VIEW MORE
story-2
3 Best / 3 Worst Parts of Modern Ford Ownership

Based on years of owning multiple modern Ford products.

By Brett Foote | 2026-06-09 10:53:36


VIEW MORE
story-3
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

SPONSORED: From muddy boots to rain-soaked cargo, these upgrades address some of the most common frustrations Ford truck owners face every day.

By Pouria Savadkouei | 2026-06-08 18:50:34


VIEW MORE
story-4
Every 2026 Ford Engine Explained

Here's everything you need to know about every Ford engine available for the 2026 model year.

By Brett Foote | 2026-06-05 12:58:01


VIEW MORE
story-5
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-6
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 15:43:58


VIEW MORE
story-7
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-06-03 11:38:36


VIEW MORE
story-8
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-9
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE