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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Speedometer Gear Question

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Old Dec 21, 2009 | 01:37 PM
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Speedometer Gear Question

Just changed the gears in my !983 F100. Put 3:73 in an 8.8.
I have an AOD transmission, What color gear do I need to put to get my speedometer right?
 
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Old Dec 21, 2009 | 05:11 PM
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Can't always goe by the color.

What's important is the number of teeth and the rotation. IIRC, the gears where the speedometer cable exits on the left side of the transmission are typically left hand rotation, and opposite for the passenger side. I had gotten that info a catalog. Not LMC, but another one and the name escapes me at the moment.
 
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Old Dec 21, 2009 | 08:43 PM
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What was the original rear end gear, factory tire size, and has there been any change to the tire size? Also, 2 or 4wd?
 
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Old Dec 25, 2009 | 02:43 PM
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It had 3.01 in it it is a 2wd with an aod. I'll have to check the tire size, but it has a taller tire on it as the specs call for
 
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Old Dec 25, 2009 | 03:14 PM
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If you provide the factory and current tire sizes I should be able to calculate the correct gear for you.
 
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Old Jan 9, 2010 | 07:45 PM
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It has P255/70R15 which I think are factory size, they measure 27 and 3/4 tall
 
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Old Jan 9, 2010 | 08:12 PM
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Not a stock tire size. Your truck should have come with an 18 tooth driven gear and a 7 tooth drive gear in the transmission. With the 255/70R15 tires and 3.73 gears you should use a 19 tooth gear.
 
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