There are 14 choices

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4x2
- 3.21 ratio
- 3.73 ratio
- 4.56 ratio
- 5.13 ratio
4x4
- front axle
  - GM
  - Spicer
- rear axle

Ring Gear and Pinion for 1978 Chevrolet K20 Pickup

Fits: 4x2 3.21 ratio (change)

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