The NV271F Transfer Case uses both conventional Seals and O-Rings to keep oil in and water out. To disassemble the NV271F Front Case, both the Input Seal and Front Output Seal must be destroyed while removing them in order to access the Input and Front Output Shaft Snap Rings. The Output Seals were changed for the 2008 model year. Although dimensionally the same as the seal used in 1999-2007 trucks, the seal lip is made from a different material with higher heat resistance.






















