Hurst Chevrolet, GMC Differential Ring and Pinion

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63-87 GM TRUCK 12 BOLT 8.875 4.56 R&P;12 bolt;12-bolt;12T;rear end;GM;GMC;Chevy;8.875;differential;gear set;gears;ring & pinion;ring and pinion;final gear;Hurst Engineering Ring & Pinion for GM 12-Bolt Truck 4.56 Ratio;Compatible with 1963-1987 Chevy/GMC C/K Series Pickup & Blazer/Jimmy/Suburban;Everyone has different needs for their truck. One of the most dramatic changes you can make to a vehicle are the rear ring and pinion gears. Whether you are going for aggressive low end response for performance and towing, you're looking to make your truck a highway cruiser, or you have made a change to your wheel and tire size, we have a ring & pinion for you. Hurst engineering offers gear sets ranging from 3.08 to 4.56 for the GM 12-bolt rear ends to get you exactly where you need to be.;4.56 ratio;Fits GM 12-Bolt differentials;Gear tooth finish reduces friction and heat for longevity;High grade steel for strength and durability