There are 4 choices

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4x2
- (9-1/2" ring gear, 12 bolt)
  - 3.08 ratio (opt GU4)
  - 3.42 axle ratio (opt GU6)
4x4
- (9-1/2" ring gear, 12 bolt)
  - 3.08 ratio (opt GU4)
  - 3.42 axle ratio (opt GU6)

Rear Axle Assembly for 2015 GMC R1500 Suburban

Fits: 4x2 9-1/2 ring gear, 12 bolt 3.08 ratio opt GU4 (change)

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