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The powertrain control module (PCM) is another important factor in late-model engine swaps. We sent ours to Pac Fab, where they reflashed it to work with our swap based on a questionnaire about transmission, tire size, gearing, and other details. The PCM controls both the engine and the transmission in a stock application, and because we are using the factory automatic transmission that came behind the 6.0L from our donor vehicle our PCM will keep the transmission control parameters.