View image 10-Bolt 8.5'' (Corporate) 8.50'' Diameter Ring Gear 1.626'' Pinion Diameter 30 Spline Pinion 10-bolt cover When replacing a stock 2.56 and numerically lower ratio, the carrier must be replaced with a carrier of 2.73 or higher. Fits: 70-76 Bel-Air/Caprice/Impala/Chevelle/Olds F-85, 73-76 El Camino, 70-75 Nova, 70-81 Camaro/Firebird/GTO, 72-81 Z-28/Trans-Am, 77-87 K10/K20 (front), 77-91 Blazer (front), 80-02 C10/K10/Blazer/C1500/K15
View image 10-Bolt 8.5'' (Corporate) 8.50'' Diameter Ring Gear 1.626'' Pinion Diameter 30 Spline Pinion 10-bolt cover When replacing a stock 2.56 and numerically lower ratio, the carrier must be replaced with a carrier of 2.73 or higher. Fits: 70-76 Bel-Air/Caprice/Impala/Chevelle/Olds F-85, 73-76 El Camino, 70-75 Nova, 70-81 Camaro/Firebird/GTO, 72-81 Z-28/Trans-Am, 77-87 K10/K20 (front), 77-91 Blazer (front), 80-02 C10/K10/Blazer/C1500/K15