There are 8 choices

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4x2
- 7-5/8" ring gear
  - 3.08 ratio (opt GU4)
  - 3.42 axle ratio (opt GU6)
- 8-1/2" ring gear (3.42 ratio, GU6)
4x4
- ZR2 (high wider performance package, 3.73 ratio, opt GT4)
- Without ZR2
  - 7-5/8" ring gear
  - 8-1/2" ring gear (3.42 ratio, GU6)

Rear Axle Assembly for 1998 GMC S15 Jimmy

Fits: 4x4 ZR2 high wider performance package, 3.73 ratio, opt GT4 (change)

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