Need Speedo gear for my 64 dart

found this from 2009 discussion:
These colors do not appear in my FSM. My guess is that they are for later model transmissions:
Light Blue - 28 teeth
Natural (Beige?) - 27 teeth

1962 - 1965 Speedometer Pinions

16 - Brown
17 - Orange
18 - Dark Purple
19 - Dark Blue
20 - Green
21 - Gray
anyone else have the color/teeth options for the 60-65 style cars?
more:


6.50-13 2.93 17 orange
3.23 19 dk blue
3.55 20 green
3.91 21 grey
7.00-13 2.93 17 orange
3.23 18 dk purple
3.55 20 green
3.91 21 grey
7.00-14 2.76 16 brown
2.93 16 brown
3.23 18 dk purple
3.31 18 dk purple
3.55 19 dk blue
3.91 21 grey

Boldface line above is closest match for the OP's tire size and gear ratio. The 1965 FPC does not list 7.00-14 as an available tire size, because tire sizes changed in '65. The old 7.00-14's new equivalent was 7.35x14, and the old 6.50-14's new equivalent was 6.95x14. The '65 FPC chart calls for a 20-tooth green pinion for both 6.95x14 and 7.35x14. Checking this chart, we see that a 7.00-14 is most closely equivalent to P205/70R14, which is the size the OP is running. We also see that the difference between 6.95x14 and 7.35x14 is the difference between a P185/75R14 and a P195/75R14 or between a P195/70R14 and a P205/70R14, a difference not large enough to call for a different speedo pinion.

So, either a 19- or a 20-tooth pinion will get the OP's speedometer into the ballpark of accuracy. A 19-tooth will drive the speedo a little faster, a 20-tooth a little slower. The tire size equivalences in charts like the one above are approximations, but given that the P205/70R14 is on the larger-diameter side of the 6.95/7.35 split, a 19-tooth pinion is probably the best pick. Selectivity with the '60-'65 pinions isn't anywhere near as fine as with the larger '66-up pinions.

But an 18-tooth pinion is definitely not the right one for this application.



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