Transmission gear selector switches have changed constantly. Regardless of the name (Park – Neutral, MLPS, DTR, IMS, etc.) many changes transcend switch configuration or bolt design. Upgrades can involve the electrical pin count which results in confusion by the technician. It is important to know if a pin count changes, why and will it interchange on
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.