Performance Differential Ring and Pinion (10 Bolt) good year # 35 MACK BRUSH METAL SPRING COIL Also known as a MACK BRUSH METAL SPRING COIL PAINT BRUSH BOX 5" x 6 1 2" 1975 – 1986 Pontiac Bonneville 1975 – 1981 Pontiac Catalina 1977 – 2002 Pontiac Firebird 1978 – 1980 Pontiac Grand Am 1977 – 1983 Pontiac Grand LeMans 1977 – 1987 Pontiac Grand Prix 1977 – 1978 Pontiac Grand Safari 1977 – 1981 Pontiac Laurentian 1977 – 1981 Pontiac LeMans 1977 – 1986 Pontiac Parisienne 1977 – 1979 Pontiac Phoenix 1976 – 1977 Pontiac Ventura – 1975 Buick Apollo 1977 – 1981 Buick Century 1991 – 1996 Buick Commercial Chassis 1976 – 1985 Buick Electra 1977 – 1983 Buick Estate Wagon 1975 – 1985 Buick LeSabre 1977 – 1979 Buick Opel 1977 – 1987 Buick Regal 1977 – 1978 Buick Riviera 1991 – 1996 Buick Roadmaster 1975 – 1979 Buick Skylark 1987 438 (Inch) Pinion Spline Count 27 Ring Gear Bolt Quantity 10 Ring Gear Material 8620 Steel Ring Gear Outside Diameter 7