Assembly and Component Identification

WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, and 2018 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.

Check the transfer case assembly bar code label (1) to determine if the assembly contains first or second design components. Refer to: Magna Transfer Case Bar Code Label and the Production Assembly Breakpoints Table.

Fig 1: Transfer Case Assembly Bar Code Label
Courtesy of GENERAL MOTORS COMPANY
Separate the case halves. Refer to Transfer Case Disassemble .

Fig 2: Separated Case Halves
Courtesy of GENERAL MOTORS COMPANY
Removethe rear output shaft assembly (1) and the high/low clutch (2).

Fig 3: Rear Output Shaft Assembly And High/Low Clutch
Courtesy of GENERAL MOTORS COMPANY
Inspect the rear face of the input shaft. (LD)

Fig 4: Oil Drain Holes
Courtesy of GENERAL MOTORS COMPANY

A light duty assembly with first design components can be identified by an input shaft with 2 oil drain holes (1) 180 degrees apart.

A light duty assembly with second design components can be identified by an input shaft with 3 oil drain holes 120 degrees apart.

Fig 5: Oil Drain Holes

Courtesy of GENERAL MOTORS COMPANY

Inspect the rear face of the input shaft. (HD)
A heavy duty assembly with first design components can be identified by an input shaft with 2 oil drain holes (1) 180 degrees apart.

A heavy duty assembly with second design components can be identified by an input shaft with 3 oil drain holes 120 degrees apart.
Refer to: Appropriate Parts Identification Table.