2011-2014 GM Duramax Heavy Duty Replacement Transmission Cooler Lines 2011-2014 GM 2500/3500 Fleece PerformanceReplace your leaking transmission lines with our heavy duty, high flow, flexible transmission lines. Our kit is the most complete replacement transmission line kit available for your LML truck! With an increased diameter over stock and heavy duty hose wrap, these lines will increase overall flow and protect against future failures. Kit Includes: (3) 5 8 inch ID transmission lines with AN fittings (6) 7 8 inch 14 O ring to 10AN fittings (2) Large OD