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GMC 1500 PICKUP
- 4x2
  - 12 bolt cover
  - 3.07 ratio
  - 3.40 ratio
  - 3.73 ratio
  - 4.11 ratio
- 4x4
  - front axle
    - GM manufactured
    - Spicer manufactured
      - 2.76 thru 3.73 ratios
      - 3.92 thru 4.11 ratios
  - rear axle
    - 12 bolt cover
      - 3.73 ratio
      - 4.11 ratio
    - 3.07 ratio
    - 3.40 ratio
    - 3.73 ratio
    - 4.11 ratio
SUBURBAN 1500
- 4x2
  - 12 bolt cover
    - 3.07 ratio
    - 3.73 ratio
    - 4.11 ratio
  - 3.07 ratio
  - 3.40 ratio
  - 3.73 ratio
  - 4.11 ratio
- 4x4
  - front axle
  - rear axle
    - 12 bolt cover
      - 3.73 ratio
      - 4.11 ratio
    - 3.07 ratio
    - 3.40 ratio
    - 3.73 ratio
    - 4.11 ratio

Ring Gear and Pinion for 1977 GMC C15 Suburban

Fits: SUBURBAN 1500 4x2 12 bolt cover 3.73 ratio (change)

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