Transfer Case Identification

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Fig 1: Transfer Case Identification

Courtesy of GENERAL MOTORS CORP.

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, L-Van, 4 or 6 = GMT 800
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)

The information on this tag is necessary for servicing the transfer case. If the tag is removed or becomes dislodged during service operations, keep the identification tag with the unit.