1955 F100 Speedometer help needed
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1955 F100 Speedometer help needed
Hi,
I just took my speedo to the shop for overhauling as it is "chasing" the actual speed and reacting extremely bad on changes.
But to adjust the speedo the guy needs the travel pulse number which should be printed somewhere on the speedo. Unfortunately we couldn't find anything on mine.
Assuming that all speedos of that year are the same I would ask some of you guys to check if you could find anything that would possibly help.
Thanks upfront for all your efforts.
Greetings from Germany!
Uwe
I just took my speedo to the shop for overhauling as it is "chasing" the actual speed and reacting extremely bad on changes.
But to adjust the speedo the guy needs the travel pulse number which should be printed somewhere on the speedo. Unfortunately we couldn't find anything on mine.
Assuming that all speedos of that year are the same I would ask some of you guys to check if you could find anything that would possibly help.
Thanks upfront for all your efforts.
Greetings from Germany!
Uwe
Laughing Gas
Joined: Nov 2010
Posts: 859
Likes: 85
From: Queen Creek AZ
Hi,
I just took my speedo to the shop for overhauling as it is "chasing" the actual speed and reacting extremely bad on changes.
But to adjust the speedo the guy needs the travel pulse number which should be printed somewhere on the speedo. Unfortunately we couldn't find anything on mine.
Assuming that all speedos of that year are the same I would ask some of you guys to check if you could find anything that would possibly help.
Thanks upfront for all your efforts.
Greetings from Germany!
Uwe
I just took my speedo to the shop for overhauling as it is "chasing" the actual speed and reacting extremely bad on changes.
But to adjust the speedo the guy needs the travel pulse number which should be printed somewhere on the speedo. Unfortunately we couldn't find anything on mine.
Assuming that all speedos of that year are the same I would ask some of you guys to check if you could find anything that would possibly help.
Thanks upfront for all your efforts.
Greetings from Germany!
Uwe
Hope this helps.
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The math would probably be not too much of an issue, I'd rather see a problem getting the correct gear combination that fits the tranny. Anyway I will keep it at miles like my other vehicles. I got my first US car in 2011 and ever since I do the conversion on the fly while driving - no problem once you have the important speeds memorized.
Also there would be a small issue as the truck speedo only shows up to 90 and that's not very much in kph to drive around.
Also there would be a small issue as the truck speedo only shows up to 90 and that's not very much in kph to drive around.
5th Wheeling
Joined: Aug 2020
Posts: 45
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Hope you got the needed info.
Ken, changing to Metric is a matter of font, not calibration. If 50mph is at noon, it remains the same location (noon) on a Metric speedometer, only it reads 80km/h
I've dealt with swapping speedometers or gauge clusters on a number of projects between Canadian and American parts.
I've dealt with swapping speedometers or gauge clusters on a number of projects between Canadian and American parts.
Laughing Gas
Joined: Nov 2010
Posts: 859
Likes: 85
From: Queen Creek AZ
Hope you got the needed info.
Ken, changing to Metric is a matter of font, not calibration. If 50mph is at noon, it remains the same location (noon) on a Metric speedometer, only it reads 80km/h
I've dealt with swapping speedometers or gauge clusters on a number of projects between Canadian and American parts.
Ken, changing to Metric is a matter of font, not calibration. If 50mph is at noon, it remains the same location (noon) on a Metric speedometer, only it reads 80km/h
I've dealt with swapping speedometers or gauge clusters on a number of projects between Canadian and American parts.
Ken
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5th Wheeling
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I don't know if you are outside of the US to want that, but cool nonetheless.
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Got the speedo back from the shop. Told the guy not to do any cosmetics to keep the "worn" look. He just redid the back of the housing due to some rust. All in all it looks and works works great, he also could fix the Temperature Gauge (which I broke during the first cleaning after removing the dash).
The only issue I'm having now that the speedo is real sensitive and reacting to speed changes faster than the GPS. Need to do more testing here to check how correct it is. Looks like it is showing too slow. Not knowing what exact drive gear I have in the tranny (I was assuming it to be a 7-tooth (yellow), I started out with a 17 tooth driven (according to the gear calculator). As this seems to be showing the speed too low I canged to a 16 and it still is slow but not throughout the speed range (shows quite exact around 30 - 40 mls). Would like to try a 15 or 14 tooth but as far as I found out those are not existing. Doese anyone have experience or can tell me if the drive gear can be replaced without removing the tranny and/or maybe has some sort of instruction?
Greetings from Germany!
Uwe
The only issue I'm having now that the speedo is real sensitive and reacting to speed changes faster than the GPS. Need to do more testing here to check how correct it is. Looks like it is showing too slow. Not knowing what exact drive gear I have in the tranny (I was assuming it to be a 7-tooth (yellow), I started out with a 17 tooth driven (according to the gear calculator). As this seems to be showing the speed too low I canged to a 16 and it still is slow but not throughout the speed range (shows quite exact around 30 - 40 mls). Would like to try a 15 or 14 tooth but as far as I found out those are not existing. Doese anyone have experience or can tell me if the drive gear can be replaced without removing the tranny and/or maybe has some sort of instruction?
Greetings from Germany!
Uwe
Laughing Gas
Joined: Nov 2010
Posts: 859
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From: Queen Creek AZ
Your speedo looks nice! I have no idea what gears are available for the original transmissions, but a way I always checked my speedo for accuracy is drive a mile at a set speed and time myself in seconds. There are 3600 seconds in an hour, so if divide that by how long it took to drive that mile, that's your average speed. For example if you drive a mile in 55 seconds, 3600 ÷ 55 = 65.45 mph