I See It, But I Don’t See It!
Incorrectly installed 4T65-E internal mode switch causes shift problems
I got a call from a technician who was working on a 4T65-E. It seems that after the freshly rebuilt transmission was re-installed, the car would not start in park or neutral and the transmission would make a wrong-gear start and shift only once. I came to find out that this was not an original problem, which means it was created during the repair process.