The Sun Coast GM-1058-3D Triple Disc Torque Converter is great for everyday driving in your 2001-2010 GM 6.6L Duramax. Designed for stock to medium size turbos and big HP tunes. It will brake stall at 2300 RPM, but still couples at cruising speeds. Shifts at 2000-2500 and you will see about a 500 RPM drop.