1999 GMC C2500 equipped with 7.4L V8 Gas OHV, 6.5L V8 Diesel OHV Turbo, 5.7L V8 Gas OHV, 5.7L V8 CNG OHV, 5.0L V8 Gas OHV
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Rear
M20X1.5 **8.50/8.625 RING GEAR SAGINAW-AMERICAN AXLE**10 BOLT DIFF**,**9.50 RING GEAR SAGINAW-AMERICAN AXLE**,** 10.50 RING GEAR SAGINAW-AMERICAN AXLE ** 21MM LONG
1999 GMC C2500 equipped with 7.4L V8 Gas OHV, 6.5L V8 Diesel OHV Turbo, 5.7L V8 Gas OHV, 5.7L V8 CNG OHV, 5.0L V8 Gas OHV
Rear
M20X1.5 **8.50/8.625 RING GEAR SAGINAW-AMERICAN AXLE**10 BOLT DIFF**,**9.50 RING GEAR SAGINAW-AMERICAN AXLE**,** 10.50 RING GEAR SAGINAW-AMERICAN AXLE ** 21MM LONG