speedo problem
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New User
Joined: Jun 2015
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From: Hillsboro
speedo problem
I have 65 Ford F100. The speedo is off. When the speedo shows that I am doing 40, I am actually doing 60. Is there anyway to fix that? Or do I need to get a new one, if so where do I find one at. Thanks in advance.
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
There are two speedometer gears, the DRIVEN gear is at the end of the cable where it fits into the trans. The DRIVE gear is located on the transmission output shaft.
Remove the DRIVEN gear, see if it's nylon or steel and count the number of teeth it has.
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
The DRIVE gears may be available from Ford, may be obsolete, only available NOS
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You can also get a Gear ratio adapter to install between the transmission and the cable to adjust the speedometer reading. I used one on mine since the rear end gears were changed to 3.25 to 1 ratio. Here is an example on eBay: http://www.ebay.com/itm/Gear-Ratio-Adapter-to-speed-your-Speedometer-up-78-/360843510029?hash=item5403f3010d
Looks like something along the lines of a +50% would work for your application.
Looks like something along the lines of a +50% would work for your application.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
Bouncing needle could also be caused by a worn gear in the speedometer head itself, only fixed by a speedometer shop.
Logistics Pro
Joined: Dec 2004
Posts: 4,651
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From: Hemet ca.
A long time ago a mechanic friend of mine would remove cable and insert one end into a drill, the other end would be placed in a container that had white lithium grease and automatic transmission fluid. Mixed real well of course.
By running the drill it would suck up the mixture into the sheath thus lubricating the inside. I've done this once with good results. As long as the sheath is not broke or kinked this should work.