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Old 08-25-2003, 05:50 PM
Trek93023 Trek93023 is offline
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Question Speedometer

I have heard both things but......does my 1998 f150 have a mechanical speedometer that cannot be reprogrammed with a reprogrammer/tuner...or one that can?
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Old 08-26-2003, 01:08 AM
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Speedometer

Your speedo isnt programmable. To recalibrate it you replace the driven gear on the VSS.
Here is what the manual says for a 1998 F150........

Speedometer Calibration
Remove the original driven gear.
Ts = Number of teeth on replacement driven gear.
To = Number of teeth on original driven gear.
Va = Actual vehicle speed.
Vi = Indicated vehicle speed.
VSS = Vehicle Speed Sensor.


NOTE: Design accuracy is: -3/+8 km/h at 50 and 100 km/h (-2/+5 mph at 30 and 60 mph).

NOTE: Use one of the following formulas.

With Va, Vi, and To known, calculate new number of driven rear teeth.
Ts = (Vi x To)/Va
Ts = (To x new tire revolutions per mile)/(old tire revolutions per mile)
Round to whole number, dropping fractions less than 0.6, and rounding up if fraction is 0.6 or higher.
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Old 08-26-2003, 10:01 PM
Trek93023 Trek93023 is offline
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Speedometer

i appreciate it...but i dont know what i need to do in order to get this done...take it to the dealership...anything and everything you can tell me is very beneficial....thanks
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Old 08-27-2003, 09:28 PM
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Speedometer

You can take it in or you can try it yourself. The VSS is held into the back of the transmission with 1 bolt. Remove the VSS and the gear is right there on it. You can count the teeth on it and then figure out what you need. Are you changing the speedo because of new gears or tires? I usually try to figure out the percent difference between the new tires and old tires or new and old gears and then go from there..... i.e. if the new tires have a 10% bigger circumference you would have to slow down the speedo by 10% which would mean you need a 10% larger driven gear......if it had a 20 tooth you would go to a 22 tooth.
I hope this helps.
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Old 08-27-2003, 09:54 PM
Trek93023 Trek93023 is offline
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Speedometer

I appreciate it so much
Thanks!
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Old 08-28-2003, 04:56 PM
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Speedometer

I'm about to lift my truck with a 3" spindle lift, the tires I'm going to use are 265/75 all terrains. The ones I have now are 255's. Do you think that would require a speedo gear change?
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Old 08-28-2003, 04:56 PM
 
 
 
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150, 1998, 2003, 4wd, driven, econoline, f150, ford, gear, located, mechanical, odometer, replace, speedometer, speedometor

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