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ACDelco Transmission Lines provide an easier more reliable connection to the external cooler. Fashioned from high-strength materials for years of reliable service. Suitable for a wide range of vehicular applications. Threading directly into your automatic transmission case a top-tier ACDelco Transmission Line is what you need to finish your low-key upgrade correctly. Fashioned from high-strength materials for years of reliable service. Suitable for a wide range of vehicular applications. Threading directly into your automatic transmission case a top-tier ACDelco Transmission Line is what you need to finish your low-key upgrade correctly.