The Shift Shaft Gaskets & Seals are crucial for smooth 4WD engagement. Issues like shifting difficulties and vibrations through the pedals can indicate wear in the seals. These can be exacerbated by related gearbox issues like a faulty Flywheel or damaged Manual Transmission Bearings. Ensuring the health of these components along with other Manual Gearbox Parts is essential to an effective transmission of power to the wheels.