1961 - 1966 F-100 & Larger F-Series Trucks Discuss the Slick Sixties Ford Truck

1962 Unibody Speedometer gear fell inside transmission

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  #16  
Old 07-25-2018, 10:36 AM
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Originally Posted by dung
Since I have a long bed it looks like I should be running a C0DD 17271-A (replaced) 16 tooth (thanks for the chart ND) regardless of the part it had.

I am not sure of my original tire size, but that seems to cover all of them.
C0DZ-17271-A (replaced C0DD-17271-A) .. 16T Speedometer DRIVEN Gear - TYPE 3a in 65/72 car parts catalog pic / Available from Ford & auto parts stores.

Myriad 1960 and later FoMoCo vehicles.

 
  #17  
Old 07-26-2018, 09:59 PM
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Here is the white plastic driven gear. Unfortunately, I couldn't see any sign of the gear or clip. I guess i will drive it and hope for the best. sorry for the horrible formatting...my computer was not cooperating
 
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Old 08-04-2018, 11:19 AM
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I just replaced the clip and driven gear and pulled on it to verify it was secure. It stripped them off the cable immediately. Could the drive gear have a problem
 
  #19  
Old 08-05-2018, 09:40 AM
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Original gear with 57 thunderbird clip


Replacement gear. Clip was not attached
I pulled the transmission last night and was able to fish out both gears and clips. The original gear still had the clip stuck in it
 
  #20  
Old 08-05-2018, 10:15 AM
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Are you sure you have the correct speedometer cable? Sounds like the clip isn't engaging the groove on the cable housing.
 
  #21  
Old 08-05-2018, 11:17 AM
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other than the speedo being bouncy it worked fine all last year. But I have no idea if it is correct
 
  #22  
Old 08-20-2018, 07:57 AM
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I got bitten by a case of the "while I am at it", the underside of the truck has been wire brushed clean, primed, and painted. I don't know if the routing of the cable caused the initial issue, but now everything is running smooth with no binding and the gear is on the end of the cable still.

However, there is 2 new problems....i need to replace my tail shaft seal. (should've done it while everything was out) and my radiator has started seeping.

I plan on doing an ls swap in the near future so don't want to spend a ton to replace this one.
 
  #23  
Old 08-20-2018, 08:10 PM
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We just did a complete disassemble and rebuild on my 1965 F-100 three speed. We found no less than three speedo gears and the metal clips in the bottom of the output shaft housing. Truck is a recent purchase so who knows how long they were in there. The gears were all whole and not shredded.

Convoy Driver
 
  #24  
Old 08-20-2018, 08:17 PM
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Wow, that is crazy...I thought I was bad leaving the first one in there!
 
  #25  
Old 08-27-2018, 09:18 AM
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I ended up buying a 5 pack of gears...using the 19 tooth gear I am pretty stinking close on the speedometer. At 55mph per GPS I am registering 57 or so. I could try the 20 tooth gear, but I don't know that it will get me any closer without actually registering low.
 
  #26  
Old 08-27-2018, 12:32 PM
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I'm such an old guy. I guess the last guy to use a "measured mile" and an analog stop watch to verify speedometer accuracy disappeared right after the dodo bird reached extinction!

It never occurred to me to use a portable GPS to read speed over ground (SOG) to compare the mechanical truck speedometer reading. Sounds like you have the right gear combination.

I do have digital instruments ...I just have analog tendency disorder ATD. My wrist watch has hands that go round and round and I like it that way.
 
  #27  
Old 08-27-2018, 12:49 PM
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Originally Posted by Convoy Driver
I'm such an old guy. I guess the last guy to use a "measured mile" and an analog stop watch to verify speedometer accuracy disappeared right after the dodo bird reached extinction!

It never occurred to me to use a portable GPS to read speed over ground (SOG) to compare the mechanical truck speedometer reading. Sounds like you have the right gear combination.

I do have digital instruments ...I just have analog tendency disorder ATD. My wrist watch has hands that go round and round and I like it that way.
Along the freeways up here there are speedometer check sections that span a 5 mile distance and have signs at each mile. These links show one of the signs and the 1 mile marker.

https://www.google.com/maps/@47.4453...7i13312!8i6656

https://www.google.com/maps/@47.4283...7i13312!8i6656

Chad
 
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