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This ATS Diesel transmission controller upgrade updates the TCM in 2015 GM 6.6L Duramax applications from A50 to T87 calibration. It is provided as a direct controller upgrade for that model year and engine configuration, intended to replace the factory module with the cited ATS unit while maintaining vehicle-specific compatibility as indicated by the manufacturer.
ATS Diesel 2015 GM 6.6L Duramax TCM Upgrade A50 to T87
