Speedometer Issue GM/CHEVY ONLYUpdated 2 years ago

This is only applicable to GM/CHEVY's only. 

If you Speedometer is off...This can be due to your instal tire size input was wrong or maybe you changed the tire size later down the road.

We can fix that! You will require a revised tune file and we require some information from you! 

Our tune techs will take this information and create a revised tune file to correct your speedometer.

Please send us the following information via our support form :Click me for support form 

• Year/Make/Model

• Complete VIN

• Transmission type (68RFE, AISIN, G56, ALLISON)

• Transfer case type: manual or SOTF

• Fuel tank type: single or double

• Tire size (GM or Chevrolet only)

• Modifications made

• AutoCal serial number (located on the back of the device)

With this information, our expert technicians will be able to diagnose the issue accurately and provide you with a revised tune file, if necessary. Please note that it may take us 1-2 business days to get back to you, as we want to ensure that we provide the best possible solution for your concerns.

Once more - please send us the information above to : Click me for support form