Restricted or damaged ventilation valve or hose

Repair or replace as required.

Worn, scored, or missing drain and/or fill plug sealing washers

Install new sealing washers and tighten the plugs per specifications.

Worn or damaged input or output shaft oil seals

Replace the oil seals as required.

Cut or damaged side cover O-ring seal

Replace the O-ring seal as required.

Case or cover porosity or leaking seal surfaces

Replace the transfer case as required.