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If you have changed the size of the wheels/tires on your car to be different from the original factory equipment, then your speedometer has likely been less accurate. To compensate for this inacuracy, you can change the gear on the transmission end of the speedometer cable to compensate. Below is a a list of those small nylon gears (speedometer driven gear) that are currently available. Since each gear has a different tooth count, they can be used to bring your speedometer back to a more accurate reading.
Keep in mind these calculators are just for reference. Many of them depend on actual tire diameter. Diameters calculated on the calculators can be significantly different from actual diameters, as manufacturers dimensions varied significantly. To be sure of a calulation, you should use actual tire circumference and calulate back to diameter.

Use our handy calculator to find which gear best fits your application.

Manual Transmission

Part Number # of teeth Color
C0DZ-17271-A 16 Wine
C3DZ-17271-C 17 White
C0DD-17271-B 18 Yellow
C0DZ-17271-B 19 Pink
C1DZ-17271-A 20 Black
C4OZ-17271-A 21 Red
DFM-17271-A 23 White (non Ford -- available
from Mustangs Unlimited)


Automatic Transmission
(7 teeth on trans drive gear, except where noted)

Part Number # of teeth Color
D0AZ-17271-A 16 Blue
C7SZ-17271-A 17 Green
C7SZ-17271-B 18 Gray
C7VY-17271-A 19 Tan
C8SZ-17271-B 20 Orange
D0OZ-17271-B 21 Purple (8 teeth on drive gear)
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Lee Lafountain
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