There are 16 choices

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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
  - 3.07 ratio
  - 3.40 ratio
  - 3.73 ratio
  - 4.11 ratio

Ring Gear and Pinion for 1977 Chevrolet K10 Pickup

Fits: 4x4 rear axle 3.07 ratio (change)

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