OEM Replacement Assembly: Genuine-style rear engine cover designed to replace GM 12705663 with factory-correct fitment for GEN V 5.3L and 6.2L truck and SUV engines including L83, L86, L82, L84, and L87 applications. Includes Pre-Installed Rear Main Seal: Features an accurately positioned, factory-style crankshaft seal to ensure consistent sealing performance, saving installation time and helping prevent alignment-related leaks during engine service. Restores Proper Crankshaft Sealing: Provides stable sealing at the rear of the engine block to reduce oil leakage risk, making it ideal for repairs, rebuilds, or preventative maintenance on high-mileage GEN V LT engines. Engineered for Durability: Constructed using high-quality OEM-grade materials designed to withstand heat, vibration, and long-term exposure to engine oil for dependable performance across varied driving conditions. Ideal for Service & Rebuilds: Suitable for leak repair, top-end refreshes, and complete engine rebuilds requiring a replacement rear cover housing to maintain reliable sealing and OEM-level performance. The GM 12705663 Rear Engine Cover with Seal is an OEM replacement assembly designed for 2014+ GEN V 5.3L and 6.2L truck and SUV engines, including L83, L86, L82, L84, and L87 applications. This factory-style housing includes the rear main seal pre-installed, ensuring proper alignment and sealing at the rear of the crankshaft. Manufactured to GM standards for fitment, durability, and sealing integrity, the assembly restores correct crankshaft sealing performance and supports dependable operation in both stock engines and service rebuilds. Ideal for repairs involving leaks, gasket service, or complete engine overhauls, this rear cover provides a reliable, ready-to-install solution that maintains OEM sealing reliability on GEN V LT truck platforms.