Speedometer gear
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Junior User
Joined: Sep 2014
Posts: 64
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From: Gig harbor
Speedometer gear
My 77 f250 has a set of 37" Toyo m/t's on it and the speedo is off at higher speeds. I was wondering if I got my speedometer re geared if it will fix this problem.
Laughing Gas
Joined: Dec 2007
Posts: 1,052
Likes: 2
From: Alvarado, TX
No need to waste your time with a shop. You just need to change the driven gear on the end of your speedo cable where it installs in the trans. It takes about a minute and a half and you can buy the gear for about $15. A gear with less teeth will drive the speedo faster which is what you need with taller tires.
Laughing Gas
Joined: Dec 2007
Posts: 1,052
Likes: 2
From: Alvarado, TX
I've used this calculator to select the right gear. Remember,you're looking for the driven gear. Leave the speedo revs per mile at 1000 and enter 7 for the drive gear teeth. You also need to know your rear gear ratio. The result will tell you which driven gear you need.
http://www.wallaceracing.com/speedo-calculator.php
Here's what the gear should look like. Make sure to get one with the proper tooth pitch. There are both right and left handed versions but they are marked as in the photo.
<a href="http://s742.photobucket.com/user/Fordworth/media/Seedo%20gears/2013-01-02_19-50-47_578_zps5ab65cdb.jpg.html" target="_blank"><img src="http://i742.photobucket.com/albums/xx65/Fordworth/Seedo%20gears/2013-01-02_19-50-47_578_zps5ab65cdb.jpg" border="0" alt=" photo 2013-01-02_19-50-47_578_zps5ab65cdb.jpg"/></a>
http://www.wallaceracing.com/speedo-calculator.php
Here's what the gear should look like. Make sure to get one with the proper tooth pitch. There are both right and left handed versions but they are marked as in the photo.
<a href="http://s742.photobucket.com/user/Fordworth/media/Seedo%20gears/2013-01-02_19-50-47_578_zps5ab65cdb.jpg.html" target="_blank"><img src="http://i742.photobucket.com/albums/xx65/Fordworth/Seedo%20gears/2013-01-02_19-50-47_578_zps5ab65cdb.jpg" border="0" alt=" photo 2013-01-02_19-50-47_578_zps5ab65cdb.jpg"/></a>
Thread Starter
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Junior User
Joined: Sep 2014
Posts: 64
Likes: 0
From: Gig harbor
No need to waste your time with a shop. You just need to change the driven gear on the end of your speedo cable where it installs in the trans. It takes about a minute and a half and you can buy the gear for about $15. A gear with less teeth will drive the speedo faster which is what you need with taller tires.
Laughing Gas
Joined: Dec 2007
Posts: 1,052
Likes: 2
From: Alvarado, TX
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