Speedometer is off

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Nov 18, 2009 | 03:23 PM

f150thatpullsalot

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Speedometer is off

So i have a 98 f150 and i found out that my speedometer is off 5 miles an hour at 70. does anyone know can this just be fixed by programming or does it need a new gear in the transfer case.
PS it has the old mechanical odometer.

98 F150 4.6 V8

Nov 18, 2009 | 08:28 PM

jennkent5454

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do you have oversized tires?

Nov 18, 2009 | 09:04 PM

f150thatpullsalot

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no they are factory size

98 f150 4.6 v8

Nov 18, 2009 | 09:15 PM

jennkent5454

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this is a shot in the dark BUT maybe disconnect the battery and reset the computer.

Nov 18, 2009 | 09:18 PM

f150thatpullsalot

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i have had it unhooked several times..... no difference, but i did have it in to the ford garage in my town and they told me it was either programming or the gear in the differential and i would rather not spend the money to have the back end tore apart if its programming i will have it reprogrammed otherwise i will live with it.

98 f150 4.6 v8

Nov 18, 2009 | 10:17 PM

steve(ill)

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i believe the older 97-98 trucks are mechanical and have a gear. The newer trucks are digital and can be programmed. If your dealer dont know what you got, i would not have them working on it.

Nov 19, 2009 | 05:10 PM

n3up

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From: Aston Pa USA

Are the stock size tires the ones it came with?

My 97 has the stock size 17" tires, but it was built with 16"s.

I had to change the gear on the VSS.

It changed by 1 tooth.

I believe 97 & 98 are VSS gear driven speedos.