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08-10-2007 10:30 AM #1
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- Car Year, Make, Model: 65 4dr hdtp LTD
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internal gear ratios on fmx and cruise-o-matic
I put 3.00 gears in my gal and and used the speedo drive gear out of an FMX
with 3.00 gears and I am reading way slower than actual speed. Do I need more teeth, or less? It has a red gear with 16 teeth currently.
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08-10-2007 11:06 AM #2
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You have to make the speedo cable spin faster, so a smaller driven gear is needed. Figure your speed error as a percentage and get a gear that much smaller.
What was the original gear ratio?Last edited by R Pope; 08-10-2007 at 11:14 AM.
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08-13-2007 01:42 PM #3
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Could it be a 10114182? If so, it is a Gen V 454, 4 bolt 1991 (or later). Hope that helps..
GM Engine de-coding