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Application: 2019-later Silverado 4500HD Medium Duty TrucksJ-39197-21 is a Package of three J-39197?1 Terminal Test probe Connectors used to diagnose the Allison Transmission in Silverado 4500HD trucks. J-39197-21 Connectors are used with J-39200-B DVOM or other components from the J-35616-F Terminal Test probe kit to ensure that the electrical components are operating as specified during Transmission diagnosis.