TRANSMISSION OIL SEAL. The transmission oil seal is a sealing component used in automatic and manual gearboxes to prevent leakage of transmission fluid while allowing rotating shafts to operate freely. The seal is installed at shaft exit points such as input shafts, output shafts and axle drive connections. Its main function is to maintain gearbox lubrication while protecting internal components from contamination by dirt, moisture and dust. The oil seal typically consists of a metal outer ring with an elastomer sealing lip made of oil-resistant rubber or fluorocarbon material reinforced with a spring to maintain consistent pressure on the shaft surface. Proper sealing ensures stable lubrication and protects transmission components from overheating and premature wear. Failure symptoms include transmission fluid leakage, oil traces around the gearbox housing and reduced lubrication levels. Our catalog includes genuine OEM transmission oil seals and quality aftermarket replacements compatible with various gearbox types. Selection is performed by VIN number, transmission model and part number. Proper replacement ensures gearbox sealing integrity and reliable drivetrain operation.