1st year a Bumpside could have a C4 was 1969. 
Shifter and Speedometer
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Shifter and Speedometer
Got another problem Gents. My '67 F100 has an automatic C4 tranny. I didn't like the shifter so I decided to replace it yesterday. What should have been a simple job turned into 3 hours. The original shifter had been modified to fit the truck floor. Said modifications did not work with my new shifter. Long story short, I have the new shifter in, hopefully the correct way, but now my Speedometer doesn't work. Any ideas? I don't even know where to start. I had to do some minor mods myself to get the new shifter installed.
Laughing Gas
Joined: Mar 2013
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From: Garner NC
Since you were working down around the tranny I would check the speedo cable there. First, see if it is still connected. If it is, you can disconnect it from the tranny, hook up a drill to it, in reverse rotation I believe and see if the speedo reacts to the drill driving the cable. If the speedo works from this then the problem is in the tranny. There is a pair of plastic gears at play here: one on the output shaft and one on the speedo drive. Pull the speedo drive out of the tranny and see if you have missing/mushed teeth. If so replace. If not you might have to pull the tail shaft housing to inspect the gear on the output shaft.
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Since you were working down around the tranny I would check the speedo cable there. First, see if it is still connected. If it is, you can disconnect it from the tranny, hook up a drill to it, in reverse rotation I believe and see if the speedo reacts to the drill driving the cable. If the speedo works from this then the problem is in the tranny. There is a pair of plastic gears at play here: one on the output shaft and one on the speedo drive. Pull the speedo drive out of the tranny and see if you have missing/mushed teeth. If so replace. If not you might have to pull the tail shaft housing to inspect the gear on the output shaft.
So this is what I'm looking at. I'm assuming the black cable is the speedometer cable. I loosened the bolt holding it to the tranny and it wouldn't even come lose. I didn't want to mess with it too much in case I made things worse. I followed the cable to where it entered the cab through the firewall, at which point I would have to get into the instrument panel (not ready to do that just yet). How am I supposed to get the cable off? And will I have to completely remove the tranny to get to the gears?
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Thru 1972, the speedometer cable and housing threads onto the back of the speedometer. You do not have to remove the cluster to access it.
Inside the speedo cable housing is a woven steel core. It's supposed to be lubed every so often, but most people are unaware.
When the lube dries out, the woven steel core binds up inside the housing and snaps.
Auto parts stores sell a woven steel core kit. Cut it to length, coat w/a fine film of graphite, install in the housing.
Nylon DRIVEN gear located at the end of the cable. Nylon or steel DRIVE gear located on the output shaft.
Once the speedo cable is removed from the trans (the nylon gear is retained w/a clip), using a flashlight, you can look in the hole to see the DRIVE gear.
Inside the speedo cable housing is a woven steel core. It's supposed to be lubed every so often, but most people are unaware.
When the lube dries out, the woven steel core binds up inside the housing and snaps.
Auto parts stores sell a woven steel core kit. Cut it to length, coat w/a fine film of graphite, install in the housing.
Nylon DRIVEN gear located at the end of the cable. Nylon or steel DRIVE gear located on the output shaft.
Once the speedo cable is removed from the trans (the nylon gear is retained w/a clip), using a flashlight, you can look in the hole to see the DRIVE gear.
Hotshot
Joined: Mar 2013
Posts: 14,255
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From: Phoenix, Az.
That black cable housing is the speedo cable. Remove that bolt and use that retainer bracket to help you slide the speedo cable out. If it's been in there a long time it may just be stubborn. The "driven" speedo gear will be attached to the speedo cable when you pull it out. Inspect it's teeth. The "drive" speedo gear will be just a bit inside the hole. If you can't see it with a flashlight, stick your finger in there and feel the top of the speedo drive gear. A good one will feel like all the teeth are the same height. Even across the top. A worn one will feel like the teeth are shorter in the middle of the gear. In a mellow "U" shape.
That C4 was transplanted in there. 1st year a Bumpside could have a C4 was 1969. So the speedo cable part number for a 1969 F100 with a C4 was C7TZ17260AD. 82" long.
This place is the only one who shows that cable in stock on the locators I use:
NOS Parts Ltd.
Recently Updated
Part Number:C7TZ17260AD
Seller:NOS Parts Ltd.
Description:CABLE ASSY.-SPEEDOMETER
Phone(972) 937-2201
That C4 was transplanted in there. 1st year a Bumpside could have a C4 was 1969. So the speedo cable part number for a 1969 F100 with a C4 was C7TZ17260AD. 82" long.
This place is the only one who shows that cable in stock on the locators I use:
NOS Parts Ltd.
Recently Updated
Part Number:C7TZ17260AD
Seller:NOS Parts Ltd.
Description:CABLE ASSY.-SPEEDOMETER
Phone(972) 937-2201
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
If it's a 240 or 300...
C4: 1965/72 F350 240; 1965/74 F100/250 240/300; 1969/77 F100 302; 1975/77 F150 302; 1975/77 F100/250 300.
1978/79 300/302 could have a C4 or C6.
1961/78: The IDIOTS @ FoMoCo used the same Warranty Plate TRANS code of G for all A/T's .. One had to know which trans was available with what engine.
1979: The IDIOTS finally woke up: G = C4 / K = C6.
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Junior User
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Thanks guys. I will start looking at these. I actually just took the cluster off to make sure the cable was still connected there. I will definitely be looking into these as starting points. Thanks.
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Junior User
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Originally Posted by NumberDummy;1735789 no6
OP failed to mention the engine size, just said 1967 F100 C4. If it's a 240 or 300...
C4: 1965/74 F100/250 240/300; 1965/72 F350 240; 1969/77 F100 302; 1975/77 F150 302; 1975/77 F100/250 300.
1978/79 300/302 could have a C4 or C6.
C4: 1965/74 F100/250 240/300; 1965/72 F350 240; 1969/77 F100 302; 1975/77 F150 302; 1975/77 F100/250 300.
1978/79 300/302 could have a C4 or C6.
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Hotshot
Joined: Mar 2013
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From: Phoenix, Az.
OP failed to mention the engine size, just said 1967 F100 C4. If it's a 352, it has MX Cruise-O-Matic (14 trans pan bolt holes). C4 has 11 trans pan bolt holes.
If it's a 240 or 300...
C4: 1965/74 F100/250 240/300; 1965/72 F350 240; 1969/77 F100 302; 1975/77 F150 302; 1975/77 F100/250 300.
1978/79 300/302 could have a C4 or C6.
If it's a 1967 w/a 352: MX Cruise-O-Matic.
If it's a 240 or 300...
C4: 1965/74 F100/250 240/300; 1965/72 F350 240; 1969/77 F100 302; 1975/77 F150 302; 1975/77 F100/250 300.
1978/79 300/302 could have a C4 or C6.
If it's a 1967 w/a 352: MX Cruise-O-Matic.
Hotshot
Joined: Mar 2013
Posts: 14,255
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From: Phoenix, Az.
We all will help ya.
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
The OP should measure the length of his trucks speedo cable before buying one, because...
The engine/trans has been swapped and there are several different lengths of cables from 1965/72 that could be used.
302 introduced Spring 1968 in Ford/Merc Passenger Cars (I was working the back counter at Ralph Williams Ford in Encino back then), in 1969 F100, Bronco & Econoline.
The engine/trans has been swapped and there are several different lengths of cables from 1965/72 that could be used.
302 introduced Spring 1968 in Ford/Merc Passenger Cars (I was working the back counter at Ralph Williams Ford in Encino back then), in 1969 F100, Bronco & Econoline.
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Junior User
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Alright. So I will take the cable off the tranny and check the gears. Possibly lube the connection to the instrument panel and measure the cable just in case. If the gears and lube aren't the issue I need a new cable. You guys are the best.
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
You need a new cable for sure. See that section of the housing missing? Right there is what caused your concern. That skinny piece that is bridging the two halves of the speedo cable casing is the speedo cable core. That is the part that spins inside .....normally.
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Junior User
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Because it did this to my arm. Maybe not the smartest move. Hopefully tomorrow after work I can get the cable off and get it measured so I can order a new one. Then take a look at the gears. Funny thing. I called a local tranny shop and they said my truck was too old for them to work on.
Laughing Gas
Joined: Oct 2013
Posts: 947
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From: Manitoba, Canada
You say you took the cluster out. Remove the cable from the back of the speedo and take it for a drive to see if the cable is spinning. By the look of the cable housing you should replace the whole thing.