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Specifications:
| Description_SHO | Ring & Pinion Set |
| Description_INV | ZG GM12P-390 |
| Description_KEY | ,**,12P,3.91,fits_3.90_&_DWN_CSE,GEAR,GM,R&P,STANDARD,ZG, |
| Description_DES | USA standard Ring & Pinion gear set for GM 12 bolt car in a 3.90 ratio |
| Description_ASM | 12P GM 3.91 R&P (fits_3.90_&_DWN_CSE) ** USA STANDARD GEAR ** |
| Description_EXT | USA Standard Gear ring and pinion sets are designed to exceed OEM specification. All sets receive rigorous in-house quality evaluation to ensure products pass dimensional, material, and fitment testing. |
| Description_FAB | Fits GM 12 bolt passenger car |
| Description_FAB | 8.875" ring gear diameter |
| Description_FAB | 30 spline pinion |
| Description_FAB | 12 ring gear bolts |
| Description_FAB | 3.90 ratio |
| Description_TLE | USA Standard Ring & Pinion gear set for GM 12 bolt car in a 3.90 ratio |
| Description_DEF | Differential Ring and Pinion |
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1964 | Chevrolet | Chevelle | 300 Wagon 4-Door |
| 1964 | Chevrolet | Chevy II | Nova Sedan 2-Door |
| 1964 | Chevrolet | Chevy II | Nova SS Coupe 2-Door |
| 1964,1966-1969 | Buick | Wildcat | Base Hardtop 2-Door |
| 1964-1965 | Buick | Wildcat | Base Coupe 2-Door |
| 1964-1965 | Chevrolet | Chevelle | 300 Wagon 2-Door |
| 1964-1965 | Chevrolet | Chevelle | Malibu Super Sport Convertible 2-Door |
| 1964-1965 | Chevrolet | Chevelle | Malibu Super Sport Hardtop 2-Door |
| 1964-1965 | Chevrolet | Impala,Bel Air,Biscayne | Base Sedan 4-Door |
| 1964-1965,1971-1972 | Chevrolet | Impala,Biscayne,Bel Air | Base Wagon 4-Door |
| 1964-1967 | Buick | Wildcat | Base Convertible 2-Door |
| 1964-1967 | Chevrolet | Chevelle | 300 Sedan 2-Door |
| 1964-1967 | Chevrolet | Chevelle | 300 Sedan 4-Door |
| 1964-1967 | Chevrolet | Chevy II | Nova Hardtop 2-Door |
| 1964-1967 | Chevrolet | Chevy II | Nova Wagon 4-Door |
| 1964-1967 | Chevrolet | Chevy II,Biscayne,Bel Air | Base Sedan 2-Door |
| 1964-1967 | Chevrolet | Chevy II,Biscayne,Bel Air,Impala | Base Sedan 4-Door |
| 1964-1967 | Chevrolet | Chevy II,Biscayne,Impala,Bel Air | Base Wagon 4-Door |
| 1964-1967 | Chevrolet | Impala | SS Convertible 2-Door |
| 1964-1967 | Chevrolet | Impala | SS Hardtop 2-Door |
| 1964-1968 | Chevrolet | Chevy II | Nova Sedan 4-Door |
| 1964-1969 | Buick | Wildcat | Base Sedan 4-Door |
| 1964-1969 | Chevrolet | Bel Air,Biscayne | Base Sedan 2-Door |
| 1964-1969 | Chevrolet | Bel Air,Biscayne,Impala | Base Wagon 4-Door |
| 1964-1969,1971-1972 | Chevrolet | Bel Air,Impala,Biscayne | Base Sedan 4-Door |
| 1964-1972 | Chevrolet | Biscayne,Bel Air,Impala | Base Wagon 4-Door |
| 1964-1972 | Chevrolet | Impala | Base Convertible 2-Door |
| 1964-1972 | Chevrolet | Impala | Base Hardtop 2-Door |
| 1964-1972 | Chevrolet | Impala | Base Hardtop 4-Door |
| 1964-1972 | Chevrolet | Impala,Biscayne,Bel Air | Base Sedan 4-Door |
| 1965 | Buick | Wildcat | Custom Coupe 2-Door |
| 1965 | Buick | Wildcat | Deluxe Convertible 2-Door |
| 1965 | Buick | Wildcat | Deluxe Coupe 2-Door |
| 1965 | Buick | Wildcat | Deluxe Hardtop 4-Door |
| 1965 | Buick | Wildcat | Deluxe Sedan 4-Door |
| 1965-1966,1968 | Chevrolet | Chevelle | Malibu Wagon 4-Door |
| 1965-1966,1968-1970 | Buick | Wildcat | Custom Convertible 2-Door |
| 1965-1966,1968-1970,1972 | Chevrolet | Chevelle | Malibu Convertible 2-Door |
| 1965-1966,1968-1972 | Chevrolet | Chevelle | Malibu Hardtop 2-Door |
| 1965-1966,1968-1972 | Chevrolet | Chevelle | Malibu Sedan 4-Door |
| 1965-1967 | Chevrolet | Chevelle | 300 Deluxe Sedan 2-Door |
| 1965-1967 | Chevrolet | Chevelle | 300 Deluxe Wagon 4-Door |
| 1965-1967 | Chevrolet | Chevy II | Nova SS Hardtop 2-Door |
| 1965-1969 | Buick | Wildcat | Base Hardtop 4-Door |
| 1965-1969 | Chevrolet | Chevelle | 300 Deluxe Sedan 4-Door |
| 1965-1970 | Buick | Wildcat | Custom Hardtop 4-Door |
| 1965-1972 | Chevrolet | Bel Air,Biscayne,Impala | Base Sedan 4-Door |
| 1965-1972 | Chevrolet | Bel Air,Impala,Biscayne | Base Wagon 4-Door |
| 1965-1972 | Chevrolet | El Camino | Base Standard Cab Pickup 2-Door |
| 1966 | Buick | Wildcat | Gran Sport Convertible 2-Door |
| 1966 | Buick | Wildcat | Gran Sport Hardtop 2-Door |
| 1966 | Chevrolet | Chevelle | Super Sport 396 Convertible 2-Door |
| 1966 | Chevrolet | Chevelle | Super Sport 396 Hardtop 2-Door |
| 1966,1968,1971 | Chevrolet | Chevelle | Malibu Hardtop 4-Door |
| 1966-1969 | Chevrolet | Biscayne,Caprice,Impala,Bel Air | Base Wagon 4-Door |
| 1966-1969 | Chevrolet | Impala,Caprice | Base Hardtop 2-Door |
| 1966-1969 | Chevrolet | Impala,Caprice | Base Hardtop 4-Door |
| 1966-1970 | Buick | Wildcat | Custom Hardtop 2-Door |
| 1966-1970 | Chevrolet | Caprice | Base Hardtop 2-Door |
| 1966-1970 | Chevrolet | Caprice | Base Hardtop 4-Door |
| 1966-1970 | Chevrolet | Caprice | Base Wagon 4-Door |
| 1967-1969 | Chevrolet | Camaro | Base Convertible 2-Door |
| 1967-1969 | Chevrolet | Camaro | RS Convertible 2-Door |
| 1967-1969 | Chevrolet | Camaro | RS Hardtop 2-Door |
| 1967-1969 | Chevrolet | Camaro | SS Convertible 2-Door |
| 1967-1969 | Chevrolet | Camaro | SS Hardtop 2-Door |
| 1967-1969 | Chevrolet | Camaro | Z28 Hardtop 2-Door |
| 1967-1969 | Chevrolet | Camaro,Caprice | Base Hardtop 2-Door |
| 1967-1970 | Chevrolet | Chevelle | SS 396 Convertible 2-Door |
| 1967-1970 | Chevrolet | Chevelle | SS 396 Hardtop 2-Door |
| 1967-1972 | Chevrolet | Chevelle | Concours Wagon 4-Door |
| 1968 | Chevrolet | Bel Air,Biscayne | Base Sedan 4-Door |
| 1968 | Chevrolet | Biscayne,Bel Air | Base Wagon 4-Door |
| 1968 | Chevrolet | Chevelle | 300 Coupe 2-Door |
| 1968 | Chevrolet | Chevelle | 300 Deluxe Coupe 2-Door |
| 1968 | Chevrolet | Chevy II | Nova Coupe 2-Door |
| 1968-1969 | Chevrolet | Chevelle | 300 Deluxe Hardtop 2-Door |
| 1968-1969 | Chevrolet | Chevelle | Concours Hardtop 4-Door |
| 1968-1969,1971-1972 | Chevrolet | Impala | Base Sedan 4-Door |
| 1968-1969,1971-1972 | Chevrolet | Impala | Base Wagon 4-Door |
| 1968-1972 | Chevrolet | Chevelle | Nomad Wagon 4-Door |
| 1968-1972 | Chevrolet | El Camino | Custom Standard Cab Pickup 2-Door |
| 1968-1972 | Chevrolet | El Camino | SS Standard Cab Pickup 2-Door |
| 1969 | Pontiac | Firebird | 350 Convertible 2-Door |
| 1969 | Pontiac | Firebird | 350 Coupe 2-Door |
| 1969 | Pontiac | Firebird | 350 HO Convertible 2-Door |
| 1969 | Pontiac | Firebird | 350 HO Coupe 2-Door |
| 1969 | Pontiac | Firebird | 400 Convertible 2-Door |
| 1969 | Pontiac | Firebird | 400 Coupe 2-Door |
| 1969 | Pontiac | Firebird | Base Convertible 2-Door |
| 1969 | Pontiac | Firebird | Sprint Convertible 2-Door |
| 1969 | Pontiac | Firebird | Sprint Coupe 2-Door |
| 1969 | Pontiac | Firebird | Trans Am Convertible 2-Door |
| 1969-1972 | Chevrolet | Chevelle | Concours Estate Wagon 4-Door |
| 1969-1972 | Chevrolet | Chevelle | Greenbrier Wagon 4-Door |
| 1969-1972 | Chevrolet | Impala,Bel Air,Biscayne | Base Wagon 4-Door |
| 1969-1972 | Chevrolet | Nova | Base Coupe 2-Door |
| 1969-1972 | Chevrolet | Nova,Bel Air,Biscayne,Impala | Base Sedan 4-Door |
| 1969-1972 | Pontiac | Firebird | Base Coupe 2-Door |
| 1969-1972 | Pontiac | Firebird | Trans Am Coupe 2-Door |
| 1970-1971 | Pontiac | GTO | The Judge Convertible 2-Door |
| 1970-1971 | Pontiac | GTO | The Judge Coupe 2-Door |
| 1970-1972 | Chevrolet | Biscayne,Bel Air,Impala,Chevelle,Nova | Base Sedan 4-Door |
| 1970-1972 | Chevrolet | Biscayne,Impala,Bel Air | Base Wagon 4-Door |
| 1970-1972 | Chevrolet | Camaro | Base Coupe 2-Door |
| 1970-1972 | Chevrolet | Camaro | RS Coupe 2-Door |
| 1970-1972 | Chevrolet | Camaro | SS Coupe 2-Door |
| 1970-1972 | Chevrolet | Camaro | Z28 Coupe 2-Door |
| 1970-1972 | Chevrolet | Monte Carlo,Impala,Chevelle | Base Hardtop 2-Door |
| 1970-1972 | Pontiac | Firebird | Esprit Coupe 2-Door |
| 1970-1972 | Pontiac | Firebird | Formula Coupe 2-Door |
| 1970-1972 | Pontiac | GTO | Base Convertible 2-Door |
| 1970-1972 | Pontiac | GTO | Base Hardtop 2-Door |
| 1971-1972 | Chevrolet | Chevelle | SS Convertible 2-Door |
| 1971-1972 | Chevrolet | Chevelle | SS Hardtop 2-Door |