Discover Transfer Case Front Output Shaft Seal & Transfer Case Output Seal Leaking. Order Transfer Case Front Output Shaft Seal Replacement. Explore Axle Shaft Seal. Maintaining the front output shaft seals of your vehicle is crucial to prevent fluid leaks that can lead to transmission damage. Look out for oil spots under your car or a decline in transmission fluid levels as telltale signs that replacement is overdue. When selecting a new seal, opt for high-quality materials like nitrile or silicone that offer durability and temperature resistance. Consider seals designed with unique features like dust lips for added protection against contaminants. Proper installation is key, so ensure the seal is seated evenly to avoid future leaks, and always refer to your vehicle's specifications to choose the correct fit for a seamless shopping experience online.