Speedo Gear
Cross-Country
Joined: Mar 2024
Posts: 67
Likes: 38
We're gonna need a little more info to help you. Need to know tire size and rear axle ratio. Just because you changed to 17" wheels, doesn't mean you have to change your speedometer gear. If your tire size is close to stock diameter, it should be fine. To my knowledge, all the gears are plastic. Is there a reason you want a metal gear? Did yours fail? If so, you might need a new cable, or your cable might be routed wrong. Can't have any sharp bends . If you google ford speedometer gear chart, there are several results with part numbers that can tell you what you need to know.
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Fleet Mechanic
Joined: Apr 2017
Posts: 1,391
Likes: 106
From: COSMOS
We're gonna need a little more info to help you. Need to know tire size and rear axle ratio. Just because you changed to 17" wheels, doesn't mean you have to change your speedometer gear. If your tire size is close to stock diameter, it should be fine. To my knowledge, all the gears are plastic. Is there a reason you want a metal gear? Did yours fail? If so, you might need a new cable, or your cable might be routed wrong. Can't have any sharp bends . If you google ford speedometer gear chart, there are several results with part numbers that can tell you what you need to know.
Speedometer cable got destroyed by the headers , my fault........I thought a metal gear might last longer than a plastic gear
Cargo Master
Joined: Mar 2014
Posts: 2,031
Likes: 72
Unless there is a bind some place, plastic gears will last a long time. That's what Ford stuck in them when they were built. Don't recall seeing a metal one, but guess they are out there. The ones I just got from the Pony store appeared to be 3-d printed plastic.
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
All said above is correct. Older trucks had metal gears. Ours are plastic (nylon blend) from Ford and I think aftermarket ones are plastic only. The rim size doesn't matter, it's the "rolling diameter" of the current tires that matter compared to original. In theory you were sold tires comparable to what you had before, so your speedo should be real close. Drive it and check if it is correct. Each tooth on the speedo driven gear is 3 to 4 MPH. More teeth slows the speedometer, less teeth speed it up. Ford used 16-21 tooth driven gears. As of 10/2018 when I retired as a Ford parts man, all were still sold by Ford. Something like $5.00 to $6.00 dollars each. But as I recall they were packaged in pairs. Your local Dealer may make you buy both. I wouldn't have, but I'm retired. 41 years was enough.
5th Wheeling
Joined: Feb 2024
Posts: 48
Likes: 16
In my 69 I have the screw in type 9 speedo with the metal gear in my C6. I can't find a speedo gear for this thing and also I need like a 13 or 14 tooth gear. I found a company in Denver that makes a devise to correct any speedo inline of the cable. Screws into the trans/cable into the little box. Easy 2mins install. Hope this helps you guys.
https://speedometercablesusa.com/gear_box_adapters.html
https://speedometercablesusa.com/gear_box_adapters.html
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