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Speedometer/Odometer Question


Fords4ever

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Manual
Recently changed the gear ratio 3.45 to 3.73 on my 92 Ranger. Tire size is 235/70R14. I extended the speedometer cable to connect with my recent install (BW1350 Transfer Case) and replaced the 18 tooth gear with a 19 tooth gear to slow the speed of the needle on the speedometer.

Now, here is my question.
I used my GPS to measure my speed in order to check it with my speedometer. I found I was 1mph slower on the speedometer (Difference in GPS and visual on the speedometer) over a 14mile drive at varied speeds.

I set my trip indicator on the truck to 00.0 and started the GPS at OO.0. I traveled 14 miles according to the GPS and 13.3 on my trip indicator. It seems that being off 0.7 miles over a 14mile trip is driving me nuts (I think I am too anal retentive). Anyway, if I increase the number of teeth, then that slows things down even more. Sooooooo, what say you:icon_confused:
 


Nhaz

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4.0 3.0
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Automatic
My gps unit is forever showing my speed(when i use the damn thing) as being 5kph slower then what i am actually doing.

I would double check with a second gps unit or have a buddy follow you.
 

martin

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I don't have a gps, but if I did it would have gone out the window by now. True distance travelled would depend on exactly where on the road you were driving, inside or outside lane of a bend etc would affect true distance travelled and most gps will not be accurate enough to determine that.
 

Fords4ever

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Manual
Thanks...guess I will go out to the hwy and measure mile markers for a while...kinda like watching paint drying on the walls:icon_twisted:
 

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