Maintain the optimal performance of your HA3 or HA4 truck with this rear main seal and housing assembly, designed to provide a secure and leak-proof seal for vehicles produced between 1990 and 1999. Crafted with high-quality materials, this essential component ensures effective oil containment, preventing leaks that could lead to engine wear and reduced efficiency. Built to precise factory specifications, this direct-fit replacement is engineered for seamless compatibility, making it an ideal solution for vehicle restoration or routine maintenance. The durable housing and reinforced seal work together to withstand continuous engine operation, temperature fluctuations, and exposure to fluids, ensuring long-lasting performance. Whether replacing a worn-out seal or performing preventative maintenance, this rear main seal and housing assembly guarantees reliable oil sealing, proper crankshaft function, and enhanced engine longevity. With an easy installation process, it allows for a hassle-free replacement, making it suitable for both professional mechanics and DIY vehicle owners.