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Excel Ring & Pinion Gear Set GM 8.5" & 8.625" 10 Bolt Ratio: 3.42 Teeth: 41-12 Applications: 1977-96 Buick Full Size 1977-91 Blazer (K Series Front) 1973-77 Apollo, Regal, Century 1971-74 Biscayne 1984-87 Grand National 1971-75, 77-79 Skylark, GS 1970-76 Chevelle 1971-96 Chevy Full Size 1970-79 Chevy II, Nova 1971-81 Camaro, Firebird, TA 1971-77 Cutlass 1976-78 Electra 1973-77 Gran Sport 1970-81 GTO, Firebird 1973-74 LeSabre 1971-89 Olds Full Size 1985-88 Olds, Hurst 1971-89 Pontiac Full Size 1985-88 Hurst Olds 1973-75, 77-79 Omega 1971-77 Grand Prix, Lemans 1971-74, 96-96 Roadmaster 1971-77 Ventura, Phoenix 1972-81 Z28 1970-76 Olds F65 1980-02 C10, C15 (Rear) 1980-02 K10, K15 (Rear) 1977-87 K10, K20 (Front) 1980-96 Suburban (Rear) 1977-91 Suburban (Front) 1973-76 El Camino 1970-96 G10, G20 Van