Richmond Ring and Pinion - 3.73 Ratio - 30 Spline Pinion - 4 Series - Thin Gear - 8.875 in - GM 12-Bolt 12BC373 Chassis Stiffeners 950 in Bore

950 in Bore

Polyurethane bushings replace the soft factory rubber bushings

Offset is the distance from the mounting surface of the starter to the engine side of the ring gear

GM A-Body 1964-75

Circuit board is encased in a clear two part silicone elastomer

Richmond Ring and Pinion - 3.73 Ratio - 30 Spline Pinion - 4 Series - Thin Gear - 8.875 in - GM 12-Bolt 12BC373 Chassis Stiffeners 950 in BoreEXCel drivetrain products are engineered to exceed OEM specifications by manufacturing to precise specifications in world class factories, using the latest heat treatment technology, with extensive quality controls throughout.; Richmond Gears EXCel drivetrain products offer high quality OEM replacement drivetrain products for your vehicle.; Richmond Gears EXCel line of ring and pinon gearsets provide Richmond quality at affordable prices.; All EXCel