Speedometer Gear
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Senior User
Joined: Jun 2010
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From: Kempner/Waco, TX
Speedometer Gear
I have 1969 F250 4x4 with 4.10 gearing in the rear. I put on some 35 inch tires, and i was wondering what speedometer gear would get me close to a stock reading on the speedometer.
Much Thanks
Mike
Much Thanks
Mike
Posting Guru
Joined: Aug 2005
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.83 % of 4.10 is 3.40.
Fleet Mechanic
Joined: Oct 2005
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From: Gainesville, GA
With the bigger tires your speedo is reading slow so to speed it up you need more teeth on the gear.
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From: Kempner/Waco, TX
Thank you now one last question. Could I grab one of these from any local auto parts store or from a ford dealership.., or do I have to order it from some where on line.
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LMC Truck Parts - Page 47
You might want to call them, they probably know which one will get you close to correct reading on the speedometer.
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Ford has used the same nylon speedometer DRIVEN gears (end of the cable) since 1960. 16 thru 21 teeth are available.
The MSRP's range from $2.02 thru $4.00 each. These gears are held to the cable with a C clip (C1DD-17292-A).
The problem is: When looking these gears up in the 1964/72 truck parts catalog, the only tires listed are the original bias ply type. No radials or P-Metrics are listed.
Radial tures were not factory installed until the 1980's.
The MSRP's range from $2.02 thru $4.00 each. These gears are held to the cable with a C clip (C1DD-17292-A).
The problem is: When looking these gears up in the 1964/72 truck parts catalog, the only tires listed are the original bias ply type. No radials or P-Metrics are listed.
Radial tures were not factory installed until the 1980's.
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Joined: Sep 2008
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From: Waterdown, Ont.
mjshagnasty,
I'm no math genius, but it seems to me that if your speedo is reading low you would want a smaller diameter (less teeth) driven gear. Please correct me if I'm wrong. My other concern is that Ford may not have anticipated people putting tires of that size (35's) on the truck. Consequently, the smallest (16 teeth) may still not be small enough to correct the speedo error.
Just my 2 cents...
John
I'm no math genius, but it seems to me that if your speedo is reading low you would want a smaller diameter (less teeth) driven gear. Please correct me if I'm wrong. My other concern is that Ford may not have anticipated people putting tires of that size (35's) on the truck. Consequently, the smallest (16 teeth) may still not be small enough to correct the speedo error.
Just my 2 cents...
John