electronic speedo?

[78-5.3]

IF its it has 4l60e then isnt the ecm edited for what the rear end ratio and what tires size thats what happen to me they want to know what rear end i had and tire sizes

[68 TT]

Originally Posted by 78-5.3

IF its it has 4l60e then isnt the ecm edited for what the rear end ratio and what tires size thats what happen to me they want to know what rear end i had and tire sizes

You are correct. With the 4L60E you change settings in the programming to account for gearing and tire diameter.