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C6 Speedometer gear question???

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Old 05-18-2011, 11:18 PM
Rawkauf Rawkauf is offline
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C6 Speedometer gear question???

I recently purchased a 1958 F100 with a 1970 351C and C6 trans. I installed a speedometer cable in place of the broken one. The speedometer works well but is reading about 20 mph too fast (80) at approx 60 mph. The current gear is 16 tooth blue/green plastic and is about 2 inches long. I ordered a replacement 20 gear black plastic gear and it is only approx. 1 inch long. It does not work, the gear seems not to make contact. Any ideas? Thanks
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Old 05-19-2011, 03:00 AM
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Not sure what gear ratio on mine is but mine is about 5 mph off and mine is an orangish color. Someone will post soon with a better answer
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Old 05-19-2011, 05:52 AM
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sounds like the gear isn't seated completely..

the contact point is up high on the gear, close to the cable.

Sam
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1955 F100 460/c6, 3.55ls - 436 hp, 489 tq
2012 F350 4x4, DRW, 3.73ls, CC, LB, 400 hp, 800 tq
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Old 05-19-2011, 10:56 AM
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The correct 20T driven speedo gear is: C8SZ-17271-B / Orange / Available from Ford / MSRP: $3.75 // FTE sponsor PARTSGUYED.COM price: $2.70.

IMO, a 20T gear is one tooth too many for a speedo that is reading 20 MPH fast.

C7VY-17271-A .. 19T Driven Speedo Gear / Tan / Available from Ford / MSRP: $2.98 // PARTSGUYED.COM price: $2.15.
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Old 05-19-2011, 03:55 PM
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here's a good calculator

Speedometer Gear Calculator

Sam
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1955 F100 460/c6, 3.55ls - 436 hp, 489 tq
2012 F350 4x4, DRW, 3.73ls, CC, LB, 400 hp, 800 tq
2013 Keystone Alpine 3720FB 5th wheel. 40', 15,500gvwr
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