DIFFERENTIAL RING AND PINION FOR GM 8.875" (12 BOLT); 3.73 RATIO; THICK RING GEAR; REQUIRES A 2.76 TO 3.42 RATIO CARRIER FOR GM 8.875" (12 BOLT); 3.73 RATIO; THICK RING GEAR; REQUIRES A 2.76 TO 3.42 RATIO CARRIER; 1963-1964 MODELS REQUIRE A 30 SPLINE PIN
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