Drain and fill the unit with new oil with ultraviolet dye GE-28431-6 Fluorescent Oil Dye - 6 1-oz before using the GE-28428-E/J-4220 High-Intensity Black Light Kit , when inspecting for leaks.

Drain plug or fill plug leak

1. Inspect for dirty, worn, scored sealing surfaces, or missing drain and/or fill plug sealing washers.
2. Replace as required. Refer to Transfer Case Fluid Replacement .

Restricted or damaged ventilation assembly

Replace the ventilation assembly, as required.

Leaking at the transfer case left side weep hole

Replace components as required. Refer to Transfer Case Disassemble and Transfer Case Assemble .

If the leak is transmission or O-ring related, do not replace the transfer case input seal.

Leaking at the transfer case right side weep hole

1. Identify the type of oil leak.
2. Replace components as required.

Leaking at rear output shaft area

A leak at rear output shaft area is caused by either the rear output shaft seal or the rear output shaft housing O-ring seal.

Inspect and replace the O-ring or rear output shaft seal as required.

Leaking at transaxle assembly-to-transfer case interface

A transmission oil leak at the transmission-to-transfer case interface may be caused by the transmission to transfer case O-ring seal or the transmission right side drive shaft seal.

1. Identify the type of oil leak.

Note: If the leak is transmission or O-ring related, do not replace the transfer case input seal.

2. Replace components as required.

Case half seam leak

Disassemble and replace transfer case seal. Refer to Transfer Case Disassemble and Transfer Case Assemble .

Leaking through case