GM P/N 12378514 (Canadian P/N 88901045) Hypoid Gear Oil has ultraviolet dye already included within the oil.

Drain and fill the unit with new oil before using the J 28428-E black light, when inspecting for leaks. Ultraviolet dyeJ 28431-6 is not approved for use.

Restricted or damaged ventilation tube assembly

Replace the ventilation tube as required.

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

Install new sealing washers and tighten the plugs per specifications.

Leaking vehicle speed sensor or O-ring seal

Replace the sensor and/or O-ring as required.

Worn or damaged driven shaft oil seal

Replace the driven shaft oil seal and output flange as required.

Cut or damaged drive shaft housing O-ring seal

Replace the O-ring seal as required.

Worn drive shaft oil seals

Worn or damaged drive shaft oil seals may be detected by a fluid leak at the vent hole area on the bottom of the case. A red colored fluid indicates a transaxle fluid leak and a clear or brown colored fluid indicates a hypoid gear oil leak.

Replace the oil seals and the drive/driven shafts 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 cases and housings as required and reseal the assembly.