The Ford Barn

xmarine · 01-30-2019, 10:03 AM

Speedo reads about 12mph higher then GPS so my question is simply would I change speedo gear to more teeth or less teeth

katy · 01-30-2019, 10:17 AM

More.

xmarine · 01-30-2019, 12:02 PM

Thank you

Kurt in NJ · 01-30-2019, 01:13 PM

How is the odometer-- if that reads correctly the problem is in the speedometer, not the gearing la

GRutter · 01-30-2019, 10:59 PM

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If you let us know your wheel size and rear-end ratio we can tell you what your speedometer gear "should be". Then if it doesn't read correctly the problem would be in the speedo not the gearing.
For example, a 30-31 with 19" wheels and 3.78 Rear (Standard) would use an 18 tooth driven gear in the speedo turtle

01-30-2019, 10:03 AM	#1
xmarine Senior Member Join Date: Jun 2010 Location: Arkansas Posts: 125	speedo gear Speedo reads about 12mph higher then GPS so my question is simply would I change speedo gear to more teeth or less teeth

01-30-2019, 10:17 AM	#2
katy Senior Member Join Date: Jun 2015 Location: Red Deer, Alberta Posts: 5,716	Re: speedo gear More. __________________ If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn!

01-30-2019, 12:02 PM	#3
xmarine Senior Member Join Date: Jun 2010 Location: Arkansas Posts: 125	Re: speedo gear Thank you

01-30-2019, 01:13 PM	#4
Kurt in NJ Senior Member Join Date: May 2010 Location: on the Littlefield Posts: 6,556	Re: speedo gear How is the odometer-- if that reads correctly the problem is in the speedometer, not the gearing la

01-30-2019, 10:59 PM	#5
GRutter Senior Member Join Date: Sep 2017 Location: Mint Hill, North Carolina Posts: 386	Re: speedo gear Sponsored Links (Register now to hide all advertisements) If you let us know your wheel size and rear-end ratio we can tell you what your speedometer gear "should be". Then if it doesn't read correctly the problem would be in the speedo not the gearing. For example, a 30-31 with 19" wheels and 3.78 Rear (Standard) would use an 18 tooth driven gear in the speedo turtle