There are 8 choices

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high wider performance package (opt ZR2)
- transfer case opt NP1 (3 switch dash control)
  - Automatic Transmission (3.73 ratio, opt GT4)
  - Manual Transmission (3.73 ratio, opt GT4)
- transfer case opt NP8 (4 switch dash control, 3.73 ratio, opt GT4)
Without high wider performance package
- 3.42 axle ratio (opt GU6)
  - ID UR0
  - ID UR1
  - ID ZTN
  - ID ZTU
- 3.73 ratio (opt GT4)

Front Axle Assembly for 2003 GMC Sonoma

Fits: Without high wider performance package 3.42 axle ratio opt GU6 ID ZTN (change)

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