A week ago I had a customer put a 4L80 in a 2002 Camaro. I copied the transmission calibration, diagnostics and the speedo segment from a 6.0 Silverado with this tranny. The tranny have a manual valve body in it and the problem is when you are drving the car it shift from first to third even if the car is pulled down into 1st gear. Did i miss something when i copied the segment from the Silvy