Hello everyone,
I'm a long time reader but this is my first post. I have a 2000 GMC C3500 with a 5.7, 4L80E, 2wd, 4.10 open diff. I recently changed tire size from slightly oversized <265 75 16's> to factory 245 75 16's. According to my GPS the odometer is correct, but the speedometer is...