TM 9-2320-365-20-3 (1) Installed Controls or Controls Being Installed (2) Installed Transmission or Transmission Being Installed (3) Required Modification WTEC III (with ECU manufactured after October 1999)² PRE-ID w/24-pin connector (transmission serial number prior to 6510032369) Install adapter cable assembly and ID harness. WTEC III (with ECU manufactured after October 1999)² PRE-ID w/31-pin connector (transmission serial number 6510032369 to 6510080785) Install ID harness. WTEC III (with ECU manufactured after October 1999)² TID 1 (transmission serial number 6510090786 to 6510142171) No modification required. WTEC III (with ECU manufactured after October 1999)² TID 2 (transmission serial number 6510142172 to 6510262035) No modification required. WTEC III (with ECU manufactured after October 1999)² TID 3 (transmission serial number 6510262036 and subsequent) No modification required. 31-pin connector 29519127 Converts a transmission external wiring harness from a 24-pin ("D" type) connector to a 31-pin (round type connector) Transmission internal wiring harness 29529474 Converts a TID 2 transmission to a TID 1 configuration to allow WTEC II controls to communicate with the transmission ID harness 200100 Allows WTEC III controls to communicate with a PRE- ID transmission. Adapter cable assembly 29519210 Adapts a PRE-ID transmission with 24-pin ("D") type connector to a transmission external wiring harness with a 31-pin (round) connector. ²Vehicle serial number 12478 and subsequent.   Refer to Figure 1. Change 1 K-3