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2500 HD - speedo question

dperry

By dperry
in Ask A GM Technician

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dperry New Member

dperry

Posted
Posted

Had local chevy dealership install a 6" inch fabtech lift with 325 70 R17 tires and wheels.

 

Ride is great - however they do not know how to change - calibrate the new tire size in the speedometer.

 

Currently I checked it with my GPS - 70 MPH on speedo is actually 80 MPH.

 

2005 - 2500 HD - Duramax - Allison.

 

 

 

Thanks

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted
however they do not know how to change - calibrate the new tire size in the speedometer.

 

This is a Chevy dealer? They probably know how, but it is possible they will not be able to calibrate for the tires they put on the truck. If the new tires are not a size that was available on your particular truck as it came from the factory, the calibration cannot be changed to match... by the dealer.

 

You can probably do this with some aftermarket programmers, but we can't do it in the service department. We can't just dial in any ol' tire size we want.

MS3DALE Senior Enthusiast

MS3DALE

Posted
Posted

Yep,Your going to have to get an aftermarket programmer for that,Like GM-Tech said,The dealer cannot put in any tire size,It has to be one that was available from the factory.

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