Hurst Chevrolet, GMC Differential

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12TK GM 3.73-UP HCT POSITRACTION UNIT;We recommends the use of high grade Non-Synthetic GL-5 gear oil and Yukon LSD additive (or similar) for long life and smooth operation. The use of synthetic oil is not recommended and may result in aggressive or noisy operation.;12 bolt;12-bolt;12T;rear end;GM;GMC;Chevy;8.875;differential;LSD;limited slip;Hurst Engineering Limited Slip Differential for GM 12-Bolt Truck w/ Final Gear Ratio's 3.73-Up;Compatible with 1963-1987 Chevy/GMC C/K Series Pickup & Blazer/Jimmy/Suburban;Are you stuggling for traction, or just have some terrible noise coming from the GM 12-bolt in your truck? Hurst Engineering Limited Slip Differentials offer great traction and strength, but are not overly aggressive for the street. These differentials are 4-spring, composite, clutch-style, limited-slip carriers-with internal gears machined from forged 4320 steel and stronger teeth. These differentials are for GM 12-bolt 30 spline rear ends, and are compatible with 3.73-UP ring & pinion gears. Get rid of that old open differential and upgrade to a limited slip unit!;Fits 3.73 Gear Ratio & Up;Fits 12T GM with 30 Spline Axles;Composite Clutches for great driveability;Feature 4320 chromoly spider gears for ultimate durability;Gears are cut to provide the strongest teeth possible in any terrain