Speedo question

[FLTMDK]

So why is the speedometer 10mph off?

 

[fourwd1]

If you or a previous owner put larger than stock size tires on, that's why.
And it will be off by a percentage, not a specific value at all speeds. For example, if it's off by 10%, it'll read 50 but you're doing 55, at 60 you're doing 66, etc.

If it's truly 10 mph at all speeds, it's probably a mechanical error (bad speedo).

 

[FLTMDK]

It still has stock tires on the 245's. So off to find a speedo...

 

[mith]

Another option if it's still got stock tires is that the previous owner put higher gears in the rear end.

 

[FLTMDK]

What is the stock gear ratio?

 

[mith]

I'm pretty sure stock gear ratio for most is 4.10, though I've heard somewhere along the line you could get 4.56 from the factory as a special option.

 

[fourwd1]

What is the stock gear ratio?

What year?
What transmission?
What engine?

Without that info it could be anything from 3.90 to 4.88.

 

[FLTMDK]

So after some research, a couple of brain granades. and fustration I have the answer to my question. it seems that My Toy has the 4.55 rear gears. It also explains why the speedo is off so crazy, it had the 31 inch tire option....