Seals are small parts with outsized consequences: a weeping output or input seal drains gear oil, contaminates brakes and clutches, and eventually costs bearings. Replacing the seal with the correct profile at the time of assembly is far cheaper than chasing the leak after the case is back in the vehicle.

Advance Adapters 716518 Installation Notes:

• Seal Plate for NP231 Transfer Cases.
• Sold Individually.