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10.5" ring gear
- 3.73 ratio (opt GT4)
- 4.10 ratio (opt GT5)
11.5" ring gear
- (3.73 ratio, opt GT4)

Rear Axle Assembly for 2008 GMC Sierra 2500 HD

Fits: 11.5 ring gear 3.73 ratio, opt GT4 (change)

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