Rear Main Seal Kit For Chevy GMC 4.8 5.3 6.0 6.2 12633579 80626951Introduction: Timing parts contains replacement parts for your car's damaged timing chain, including the sprockets and gears needed to secure the replacement chain. Once installed, the kit's components can offer a more solid grip on the crankshaft and camshaft, synchronizes the rotation of the crank shaft and the camshafts so that the engine's valves open and close at the proper times during each cylinder's intake and exhaust strokes, allowing your