The Transfer Case Seal for Nissan 240SX prevents the escape of lubricant from the transfer case, keeping the gears cool and protected from damage. Surrounding the output shaft with a circular shield that has a tight rubber lip and a film of grease stops fluid leaking while allowing the driveshaft to spin freely. When either the Transfer Case Seal cracks or the housing bushing wears, there is a leak and a puddle forms under the vehicle. The gears may grind from the lack of oil. When it is intact, it controls the correct amount of fluid so that it has the hydraulic pressure and will not overheat and damage the transmission performance. To replace the Transfer Case Seal, lift the car. Uncouple the driveshaft by unbolting the yoke clips. Then pry the ring out. Ensure not to scratch the splines or drop debris into the case. Clean the bore. Finally, press a lubricated new Transfer Case Seal squarely into place and realign/reinstall the shaft. Throughout the entirety of the production run, there have not been any radically different versions. However, later models of the 240SX incorporated more heat resistant elastomer compounds compared with the basic nitrile designs from the early run. This gave the later designed elastomer compounds a longer life in application under pressure. A new Transfer Case Seal installed promptly and inspected regularly protects the Nissan 240SX driveline and ensures that every Nissan sports coupe is ready to deliver power.
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