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4x2
- dual rear wheels
  - 3500 HD
    - base
      - 4.63 ratio (opt GK9)
      - 5.13 ratio (opt HC7)
    - wide track (opt 5T2)
      - 4.63 ratio (opt GK9)
      - 5.13 ratio (opt HC7)
    - wide track (opt 5T2) with wrecker prep (opt 5X9)
      - 4.63 ratio (opt GK9)
      - 5.13 ratio (opt HC7)
    - wrecker prep (opt 5X9)
      - 4.63 ratio (opt GK9)
      - 5.13 ratio (opt HC7)
  - Excluding 3500 HD
    - Without wide track
      - 131" wheelbase
        3.42 axle ratio (opt GU6)
        3.73 ratio (opt GT4)
        4.10 ratio (opt GT5)
        4.56 ratio (opt HC4)
      - 135" wheelbase
        3.42 axle ratio (opt GU6)
        3.73 ratio (opt GT4)
        4.10 ratio (opt GT5)
        4.56 ratio (opt HC4)
      - 154" wheelbase
        3.42 axle ratio (opt GU6)
        3.73 ratio (opt GT4)
        4.10 ratio (opt GT5)
        4.56 ratio (opt HC4)
      - 155" wheelbase
        3.42 axle ratio (opt GU6)
        3.73 ratio (opt GT4)
        4.10 ratio (opt GT5)
        4.56 ratio (opt HC4)
      - 159" wheelbase
        3.42 axle ratio (opt GU6)
        3.73 ratio (opt GT4)
        4.10 ratio (opt GT5)
        4.56 ratio (opt HC4)
      - 168" wheelbase
        3.42 axle ratio (opt GU6)
        3.73 ratio (opt GT4)
        4.10 ratio (opt GT5)
        4.56 ratio (opt HC4)
    - wide track (opt 5T2)
- single rear wheels
  - 9000-9200 gross vehicle weight (opt 8S9)
  - Without 9000-9200 gross vehicle weight
4x4
- dual rear wheels
  - Without wide track
    - 131" wheelbase
    - 135" wheelbase
    - 154" wheelbase
    - 155" wheelbase
    - 159" wheelbase
    - 168" wheelbase
  - wide track (opt 5T2)
    - 3.42 axle ratio (opt GU6)
    - 3.73 ratio (opt GT4)
    - 4.10 ratio (opt GT5)
    - 4.56 ratio (opt HC4)
- single rear wheels
  - 9000-9200 gross vehicle weight (opt 8S9)
  - Without 9000-9200 gross vehicle weight

Rear Axle Assembly for 1999 GMC P3500

Fits: 4x4 dual rear wheels wide track opt 5T2 3.42 axle ratio opt GU6 (change)

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