The other end looks like the image on the left. Does that look right?
66 SPEEDOMETER CABLE
Thread Starter
|
Senior User
Joined: Dec 2016
Posts: 436
Likes: 0
From: Omaha,NE
66 SPEEDOMETER CABLE
My 1966 f100 is sitting on a 79 f150 frame, it has a C6 transmission. Will the speedometer cable screw right into the 66 dash? Or are there different ends that are needed?
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
1973/79: The cable is retained to the speedometer w/a clip.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
The clip retains the nylon speedometer DRIVEN gear to the cable.
Thread Starter
|
Senior User
Joined: Dec 2016
Posts: 436
Likes: 0
From: Omaha,NE
This is similar to the connection on the transmission. The other end has a threaded ferrule. NumberDummy, you are saying I am missing a plastic clip, that clips on the ferrule and back of speedometer?
Trending Topics
Thread Starter
|
Senior User
Joined: Dec 2016
Posts: 436
Likes: 0
From: Omaha,NE
This supposed to be a 1966 speedometer cable. I only see a grommet. Am I missing something here NummberDummy?
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
Top 10 Ford Truck Tragedies
Joe Kucinski
Lead Gopher
Joined: Aug 2012
Posts: 10,066
Likes: 1,616
From: Seattle
The speedometer cable itself turns - from end to end - in a 1-to-1 ratio. Meaning for every rotation at the transmission/transfer case end it will rotate one time at the speedometer head. This is always the case. The way that the speed of rotation is changed is by using different driven and drive gears at the transmission/transfer case end. There are no changes at the speedometer head itself, only underneath at the lower end. If you pull the cable out there are gears behind it that can be swapped out.
In some cases manufacturers also used small ratio changing boxes that screwed to the outside, too. Here's one example with a quick search of a GM product that changes the ratio by a factor of 1.3-to-1. This is separate from the driven and drive gears which provide for some variations. Just an example of what they sometimes did. The right (wrong?) combination of rear-end gear ratios, transmission/transfer case and tires can make for some interesting approaches over the years.
CUCV / GM TRANSMISSION SPEEDOMETER CABLE DRIVE ADAPTER 1.3 RATIO TRUCK [C4S4] | eBay
.
In some cases manufacturers also used small ratio changing boxes that screwed to the outside, too. Here's one example with a quick search of a GM product that changes the ratio by a factor of 1.3-to-1. This is separate from the driven and drive gears which provide for some variations. Just an example of what they sometimes did. The right (wrong?) combination of rear-end gear ratios, transmission/transfer case and tires can make for some interesting approaches over the years.
CUCV / GM TRANSMISSION SPEEDOMETER CABLE DRIVE ADAPTER 1.3 RATIO TRUCK [C4S4] | eBay
.
Thread Starter
|
Senior User
Joined: Dec 2016
Posts: 436
Likes: 0
From: Omaha,NE
TA455HO,Have I jacked my speedometer already? It pegged out immediately!I wonder if anyone knows the correct gear for this? 1979 f150, C6 4x4 to the original 1966 f100 speedometer.
Lead Gopher
Joined: Aug 2012
Posts: 10,066
Likes: 1,616
From: Seattle
If you go very slow and it is pegged at 100 MPH or higher then no amount of gearing changes would solve that, I wouldn't think. Not sure what might cause that other than the speedometer head itself, perhaps, but that's just a guess.
Chad
.
Chad
.