Speedo calibration

[rlozer]

Hello,

I'm having problems getting my speedo calibrated since going to 35's. I know it's done through the ABS system and you have to change the revs per mile reading. I have tried several places, two independent(both using Snap-on scanners), and one dealer. No one can get into the ABS system to change the reading. I personally know the people that have tried so I know they aren't just blowing me off.

It's not a huge deal, but it bugs me. It's 7.5% off as per GPS.
The truck is a 00' F-250 7.3(obviously) Auto trans. 4x4

Suggestions??

[thebierguy]

I thought it couldn't be calibrated on the 7.3's????

I just live with it being 2.5 MPH off.

[NoRalPh]

I did it to mine with the AutoEnginuity scanner. You don't get infinite choices, just select from a list to one that's closest to your tire. It made a difference, I'm now just like 2mph off at 40mph (according to those "radar signs").

[carolinaboy02powerstroke]

Originally Posted by NoRalPh

I did it to mine with the AutoEnginuity scanner. You don't get infinite choices, just select from a list to one that's closest to your tire. It made a difference, I'm now just like 2mph off at 40mph (according to those "radar signs").

This. I did mine and a buddies with my AE scan tool. They are worth the money if you plan on keeping the truck for any amount of time.

[Sticker Monster]

Originally Posted by NoRalPh

I did it to mine with the AutoEnginuity scanner. You don't get infinite choices, just select from a list to one that's closest to your tire. It made a difference, I'm now just like 2mph off at 40mph (according to those "radar signs").

I did this to my ex, it was about 3 mph off. I had to fudge the numbers smaller than my actual tire size by a couple inches to get closer to accurate reading according to my gps.

SM

[belz]

Get a speed wizard. Limitless calibration. Works wonderful and easy to adjust with a GPS.