There are 6 choices

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3.42 axle ratio (opt GU6)
3.73 ratio (opt GT4)
- AWD
  - opt NP3
  - opt NR3
  - opt NR4
- Without AWD
4.10 ratio (opt GT5)

Front Axle Assembly for 2006 GMC R1500 Suburban

Fits: 3.73 ratio opt GT4 AWD opt NR3 (change)

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