Transfer Case

An identification tag is attached to the rear half of the transfer case. The tag provides the following information:

• Model number (1):
  1. First Digit - 1 = Single Speed; 2 = Two-Speed
  2. Second Digit - 3 = T-Truck
  3. Third Digit - 1 = Manual; 3 = Electric Shift; 6 = Automatic; 9 = All Wheel Drive
• Assembly Number (2)
• Serial Number (Date And Shift Code) (3)
• Low Range Reduction Ratio (4)

See Fig 1.

Fig 1: Locating Transfer Case Identification Tag

Courtesy of GENERAL MOTORS CORP.