1970 Oldsmobile Cutlass Ring and Pinion Set GM 8.5 in. Rear - Oldsmobile & Pontiac - Ring and Pinion Set - 3.90 Ratio - 27 Spline Pinion - Fits 3 Series 3.08 - 3.23 Ratio Carrier - Rear guaranteed to replace your current 1970 Oldsmobile Cutlass Ring and Pinion Set GM 8.5 in. Rear - Oldsmobile & Pontiac - Ring and Pinion Set - 3.90 Ratio - 27 Spline Pinion - Fits 3 Series 3.08 - 3.23 Ratio Carrier - Rear. 1970 Oldsmobile Cutlass Ring and Pinion Set comes new OEM 1970 Oldsmobile Cutlass Ring and Pinion Set aftermarket new 1970 Oldsmobile Cutlass Ring and Pinion Set of remanufactured 1970 Oldsmobile Cutlass Ring and Pinion Set GM 8.5 in. Rear - Oldsmobile & Pontiac - Ring and Pinion Set - 3.90 Ratio - 27 Spline Pinion - Fits 3 Series 3.08 - 3.23 Ratio Carrier - Rear.