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Old 10-13-2010, 08:24 AM
Soapy Soapy is offline
2007 Ranger XL
 
Join Date: Aug 2010
Posts: 4
Default Odometer running 10 percent fast

Just acquired 2007 Ranger XL with standard tires and wheels and 4 cyl. Rear end is 3.75, (from salvage) which I believe was standard with the manual transmission....I have an automatic, . Can I assume the speedometer is also reading 10 percent low? On the Interstate yesterday, I read 88 on the odo and the road measured 80 miles. Regards, Soapy
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Old 10-13-2010, 11:32 AM
4evermodding 4evermodding is offline
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Default Re: Odometer running 10 percent fast

get a garman, and see what happens, idk what to tell you, I know when I changed from 15 to 16 im reading 4.5 miles above my actual speed, gears have to be changed or calibrated, something like that,
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Old 10-13-2010, 12:11 PM
turbo turbo is offline
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Default Re: Odometer running 10 percent fast

You can determine what the differential ratio on the truck was when it shipped by checking the code on the inside jamb of the driver door. The axle code indicated there will tell you what the original gearing was.

...that being said, the odometer and speedometer both run off the same pulses, so if one of them is inaccurate, the other will also be inaccurate. There are products on the market that supposedly can be wired "in front of" the speedo/odo module, that read the incoming pulses and create a similar stream of pulses on the output that increase/decrease the frequency by a user-defined amount so that the speedometer and odometer read correctly.
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2001 Ranger XLT 4.0L SOHC
Silver Frost w/ Dark Graphite interior


Modifications
Summit 3" Body Lift
31x10.50 A/T tires
Explorer overhead console
Explorer auto-dim mirror
Explorer auto-headlights
Aux1 & Aux2 inputs on factory AM/FM/CD/Cassette
Door-dinger silencer button
Seamless retractable roof and passenger-side ejection seat with steering wheel mounted controls and safety interlock
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Old 10-13-2010, 02:55 PM
Soapy Soapy is offline
2007 Ranger XL
 
Join Date: Aug 2010
Posts: 4
Default Re: Odometer running 10 percent fast

Thanks. The GPS confirms 10% fast running on speedo. The door sticker is damaged but the original Ford specs call for a 4.10 on an automatic. My differential is marked 3.73 in orange paint from some salvage yard. The truck is a 2007 but the differential is 2003 according to the orange paint. The difference between 4.10 and 3.73 is 10 percent....I guess maybe that's the reason it runs fast. Soapy
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