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Valve Body Designed for higher HP engine Increased pressure on lock up clutch Better shifting position   Torque Converter More torque transfer Tuned to available power Better stall RPM Welded fins Better life   Pressure Lock Increase line pressure in converter lock up Pressure increase by 130% Raises pressure for less slippage	Auto Loc Locks up torque converter with exhaust brake Works automatically Torque Loc Three position switch for optional lock up #1 - hills and heavy loads #2 - normal vehicle operation #3 - keep converter locked while using exhaust brake Click here for complete description from BD Brake