Hey, i have a '99 and ive noticed this for a while. when i drive, say for instance, 30 mph, my speedometer reads '40 mph'. or if im driving 65 mph, it reads 75 mph. ive learned to adjust to this while im driving, but i drive a standard transmission, and im afraid it will screw me up with other manuals when i drive later on in the future, cause im only 17, so i have 50+ years ahead of me driving. anyone know why it is showing up like this?

 

running different size rim/tires that are not stock may cause a fluctuation in speed but i don't think by ten mph.
You can get it re-adjusted at ford but i have no clue how much it costs.

 

could be the vss sensor going out are the ring in the pumbin are you might just have to recalbrate it. mine is dead on and im runing 33s ive never messed with it

 

^^ x2

It shouldn't screw you up for driving other vehicles though because hopefully their speedos are correct. If it scares you, cut your license up and ride a bike.....LMAO!!

 

smaller tires will make your speedo read faster than you are really going....and it'll rack up the miles on the odometer faster as well.

 

well you would think that it would rack up miles faster but it doesn't, i measured mile markers on the highway and my odometer at the same time and it was equal.

 

then your speedo should be fine. what did you use to measure your speed?

 

i use either those meters police set up on roads, and also my brother's mustang was on the phone and we were going the same speed side by side, and he told me his was 10 under what mine read. also my dads.

 

hmmm mine was off by 5mph at 70 but only like 1 or 2 at 30 when i had 30s but now that i have 33s the speedo is dead on

 

mine is a consistent 10 mph

 

mmm have you taken the needle off the guage itself? because usually if the speedo is of its of by a % and that difference is more noticable at higher speeds if yours is consistently off by 10mph thats what i suspect
do you have a handheld gps? thats really the only accurate way to tell for sure tho

 

no gps, i bought my truck used from a college kid who did alot of mods to it, he might have taken the needle off the gauge. how would i get the needle off the gauge

 

im not sure search tho i think shane (fx4wannabe) or trevor (trepaul) have a write up but yea thats what i would suspect to be the problem

 

Its probably the needle then

 

https://www.ranger-forums.com/forum2...&highlight=mph

that shows you how to get the needle off, but you won't have any way of calibrating it. Plus you have smaller tires so the speedo is already going to be off some.