TM 9-2320-365-20-3 TRANSMISSION/TRANSMISSION CONTROLS ADAPTABILITY CHART (CONT) (1) Installed Controls or Controls Being Installed (2) Installed Transmission or Transmission Being Installed (3) Required Modification WTEC II (with 24-pin connector) TID 2 (transmission serial number 6510142172 to 6510262035) Install 31-pin connector and replace transmission internal wiring harness. WTEC II (with 24-pin connector) TID 3 (transmission serial number 6510262036 and subsequent) Transmission not compatible with WTEC II controls.   Install WTEC III controls. WTEC II (with 31-pin connector) PRE-ID w/24-pin connector (transmission serial number prior to 6510032369) Install adapter cable assembly. WTEC II (with 31-pin connector) PRE-ID w/31-pin connector (transmission serial number 6510032369 to 6510090785) No modification required. WTEC II (with 31-pin connector) TID 1 (transmission serial number 6510090786 to 6510142171) No modification required. WTEC II (with 31-pin connector) TID 2 (transmission serial number 6510142172 to 6510262035) Replace transmission internal wiring harness. WTEC II (with 31-pin connector) TID 3 (transmission serial number 6510262036 and subsequent) Transmission not compatible with WTEC II controls.   Install WTEC III controls. WTEC III (with ECU manufactured prior to October 1999)¹ PRE-ID w/24-pin connector (transmission serial number prior to 6510032369) Install adapter cable assembly and ID harness. WTEC III (with ECU manufactured prior to October 1999)¹ PRE-ID w/31 pin connector (transmission serial number 6510032369 to 6510090785) Install ID harness. WTEC III (with ECU manufactured prior to October 1999)¹ TID 1 (transmission serial number 6510090786 to 6510142171) No modification required. WTEC III (with ECU manufactured prior to October 1999)¹ TID 2 (transmission serial number 6510142172 to 6510262035) No modification required. WTEC III (with ECU manufactured prior to October 1999)¹ TID 3 (transmission serial number 6510262036 and subsequent) Install new WTEC III ECU (P/N 12421787-002). ¹Vehicle serial number 12477 and lower.   Refer to Figure 1. K-2 Change 1