Richmond Gear 49-0088-1 Differential Ring & Pinion For GM 8.875" Car Axles, Gear Ratio 3.90, 12-Bolt, Thin Gear, 10 Pinion & 39 Ring Tooth –Fits Buick GM Chevrolet GMC Sprint Pontiac Acadian Beaumont

Short Summary: The Richmond Gear 3.90 Thin Ring & Pinion Set is designed for GM 8.875" (12-Bolt) car axles using carriers originally set up for 4.10 or numerically higher gear ratios. Ideal for performance upgrades or classic muscle car restorations, this high-strength gear set offers reliable power and smooth operation.Key FeaturesGear Ratio: 3.90Differential Fitment: GM 8.875" (12-Bolt) Car AxleGear Style: Thin Ring Gear – requires 4.10+ carrierTooth Count: 10 Pinion / 39 RingApplication: Rear Axle – Classic GM Car ApplicationsWarranty: 2 Years or 100,000 MilesVehicle CompatibilityFits GM 8.875" (12-Bolt) rear axles in the following classic vehicle applications:Buick1965–1972 Electra, GS, GS 350, GS 400, GS 4551965–1972 Gran Sport, LeSabre, Skylark, Special1964–1972 Sportwagon1971–1972 Centurion, Estate WagonChevrolet1965–1972 Bel Air, Camaro, Caprice, Impala, Malibu1964–1973 Chevelle1965–1972 El Camino1965–1968 Chevy II1969–1972 Nova1970–1972 Monte CarloGMC1971–1972 SprintOldsmobile1965–1972 98, Delta 88, F85, Cutlass, Cutlass Supreme1967–1968 Delmont 881965–1966 Jetstar 88, Jetstar I, Starfire1967–1972 Vista Cruiser1971 442Pontiac1965–1972 Bonneville, Catalina, GTO, Laurentian, LeMans, Parisienne1967–1972 Executive, Firebird1970–1972 Grand Prix1971–1972 Grand Safari, Grandville1965–1970 Strato-Chief1970 Tempest1965–1971 Acadian1965–1969 BeaumontReplaces OEM & Aftermarket Part NumbersDirect OE replacement for GM 12-bolt 3.90 thin ring gear applicationsWarranty & Quality AssuranceBacked by a 2-Year / 100,000-Mile Warranty, Richmond Gear ring and pinion sets are manufactured from premium materials for durability and smooth performance. Ideal for muscle car enthusiasts seeking factory-style gearing with modern engineering precision.

• Precision-engineered 3.90 ratio ring & pinion for GM 8.875" (12-bolt) car axles ideal for performance and restoration of classic GM muscle and full-size vehicles
• Thin ring gear design fits carriers originally equipped with 4.10 and numerically higher ratios—ensures correct gear mesh and durability
• Features 10-tooth pinion and 39-tooth ring gear—crafted from premium-grade steel for high strength and long-term reliability
• Compatible with 1964–1973 GM cars including Chevelle, Camaro, Firebird, GTO, Impala, LeMans, Cutlass, and more—check full compatibility by model and year
• Backed by a 2-Year or 100,000-Mile Warranty—Richmond Gear delivers top-tier performance trusted by racers and restorers alike