Drain and fill the unit with new oil with ultraviolet dye J 28431-6 Fluorescent Oil Dye - 6 1-oz before using the J 28428-E High-Intensity Black Light Kit , when inspecting for leaks.

Restricted or damaged ventilation assembly

Replace the ventilation assembly, as required.

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

Install new drain plugs and tighten the plugs per specifications.

Worn or damaged input or output shaft oil seal

Replace the output shaft oil seal, as required.

Cut or damaged output housing O-ring seal

Replace the O-ring seal, as required.

Worn internal shaft oil seals

Worn or damaged internal shaft oil seals may be detected by a fluid leak at the vent hole area on the bottom of the cover.

Replace the oil seals, as required.

Worn or damaged right side axle shaft oil seal

Replace the axle shaft oil seal and axle shaft, as required.

Cut or damaged transaxle assembly-to-transfer case O-ring seals

Replace the O-ring seals, as required.

Cases or housings porosity or leaking seal surfaces

Replace the transfer case assembly if it cannot be repaired.