Richmond Gear 49-0070-1, Differential Ring & Pinion, For GM 8.875" (12 Bolt) Truck Axle, Gear Ratio 3.42, 12-Bolt, 30 Spline Pinion, Fits Chevy & GMC Trucks 1964–1982, Replaces 12BT342, GM12-342

Short Summary: The Richmond Gear 49-0070-1 Differential Ring & Pinion set is engineered for GM 8.875" (12 Bolt) rear axles commonly found in Chevrolet and GMC trucks and vans from 1964–1982. Featuring a 3.42 gear ratio and requiring a 2.76–3.42 carrier, this set is ideal for OE replacement, offering strength, reliability, and smooth performance in classic applications.Key FeaturesAxle Fitment: Fits GM 8.875" (12 Bolt) rear differentials in classic Chevy and GMC trucks, vans, and SUVs from 1964–1982.Gear Ratio: 3.42 ratio designed for use with 2.76 to 3.42 carrier; provides a balance of towing power and fuel efficiency.Spline Compatibility: 30-spline pinion yoke required for 1963–1964 applications; confirm fitment for early models.Durable Construction: Manufactured to Richmond Gear's premium standards for quiet operation, strength, and long-term durability.Vehicle Compatibility: Covers a broad range of GM trucks and vans from the mid-1960s to early 1980s, including C/K Series, Blazer, Suburban, and G/P series vans.Warranty: Covered by a 2-Year / 100,000-Mile warranty for performance and peace of mind.Vehicle CompatibilityThe Richmond Gear 49-0070-1 is designed for GM 8.875" (12 Bolt) truck axles. It fits the following vehicles:Chevrolet1969–1974 Blazer1975–1982 C101965–1967 C10 Panel1964–1974 C10 Pickup1967–1982 C10 Suburban1975–1981 C201969–1974 C20 Pickup1973–1981 C20 Suburban1975–1981 G101964–1974 G10 Van1975–1981 G201967–1974 G20 Van1975–1981 K101964–1974 K10 Pickup1967–1982 K10 Suburban1975–1981 K201969–1974 K20 Pickup1973–1981 K20 Suburban1975–1981 K5 Blazer1975–1980 P101965–1967 P10 Series1967–1974 P10 Van1975–1981 P201966–1967 P20 Series1968–1974 P20 Van1965–1966 SuburbanGMC1975–1978 C151975–1978 C15 Suburban1967–1974 C15/C1500 Pickup1967–1974 C15/C1500 Suburban1979–1982 C15001979–1981 C1500 Suburban1975–1978 C251975–1978 C25 Suburban1969–1974 C25/C2500 Pickup1969–1974 C25/C2500 Suburban1979–1981 C25001979–1981 C2500 Suburban1965–1966 G1000 Series1975–1978 G151967–1974 G15/G1500 Van1979–1981 G15001975–1978 G251967–1974 G25/G2500 Van1979–1981 G25001970–1981 Jimmy1966–1966 K1000 Pickup1975–1978 K151975–1978 K15 Suburban1966–1974 K15/K1500 Pickup1967–1974 K15/K1500 Suburban1979–1982 K15001979–1982 K1500 Suburban1975–1978 P151967–1974 P15/P1500 Van1979–1980 P15001975–1978 P251967–1974 P25/P2500 Van1979–1981 P25001965–1966 PB1000 Series1966–1966 PB15 Series1965–1965 PB1500 Series1966–1966 PB2500 VanReplaces OEM & Aftermarket Part NumbersEXCEL from Richmond: 12BT342Motive Gear: GM12-342Warranty & Quality AssuranceRichmond Gear provides a 2-Year / 100,000-Mile warranty on the 49-0070-1 ring and pinion set. Built to OEM-level tolerances and trusted by professionals, it ensures long-lasting durability and performance in vintage GM 12-bolt truck applications.

• Designed for GM 8.875" (12 Bolt) Axles: Richmond Gear 49-0070-1 fits GM 8.875" (12 Bolt) rear axles found in Chevrolet and GMC trucks, vans, and SUVs from 1964–1982. Ideal for daily driving and stock rebuilds requiring a 3.42 ratio with a 2.76–3.42 carrier.
• 3.42 Gear Ratio for Optimal Performance: Features a 3.42 gear ratio, delivering a balance of towing power and highway efficiency. Requires a compatible carrier for 2.76 to 3.42 ratios, making it ideal for OE-style performance and light-duty applications.
• Heavy-Duty OEM-Grade Construction: Manufactured with precision engineering using durable materials to ensure strength, quiet operation, and long-lasting performance—perfect for classic truck restorations or differential upgrades.
• Installation Note for Early Models: For 1963–1964 GM applications, a 30-spline pinion yoke is required for proper installation. Confirm your spline and carrier compatibility before purchasing for a seamless fit.
• Replaces Multiple Aftermarket Part Numbers: Direct replacement for EXCEL 12BT342 and Motive Gear GM12-342. Backed by a 2-Year / 100,000-Mile Richmond Gear warranty, ensuring reliable performance and peace of mind for classic GM truck owners.