EXCEL from Richmond 12BC373T 3.73 Ratio Ring & Pinion for GM 8.875" (12 Bolt) Car – Fits Chevrolet Camaro, Chevelle, Impala, Pontiac Firebird, GTO (1964-1973) – Durable 8620 Steel – 1-Year/50K-Mile Warranty
Upgrade your classic GM muscle car or full-size vehicle with the EXCEL from Richmond 3.73 Ratio Ring & Pinion Set. Designed for GM 8.875" (12 Bolt) rear differentials, this precision-engineered gear set delivers improved acceleration, power transfer, and drivetrain efficiency.
3.73 Gear Ratio: Optimized for street performance and highway cruising.
High-Strength 8620 Steel: Resists wear, ensuring long-lasting durability.
Precision-Machined for Smooth Operation: Reduces noise and vibration for quiet, efficient power transfer.
Designed for GM 8.875" (12 Bolt) Rear Differentials: Requires a 3.07 to 3.73 carrier for installation.
Perfect for Restorations & Performance Builds: Enhances classic muscle cars and full-size GM vehicles.
Compatible with GM 8.875" (12 Bolt) Rear Differentials in:
1967-1972 Chevrolet Camaro
1964-1973 Chevrolet Chevelle
1965-1972 Chevrolet Impala / El Camino
1967-1972 Pontiac Firebird
1965-1972 Pontiac GTO / LeMans
1965-1972 Buick Skylark / GS / Electra
And other GM full-size models (1964-1972)
USA Standard Gear: 36167, ZG GM12P-373
Richmond Gear: 49-0039-1
Motive Gear: G888373
Revolution Gear & Axle: GM12P-373-4
Comes with a 1-Year / 50,000-Mile Warranty for peace of mind and reliability.
EXCEL from Richmond is a trusted name in performance and replacement gear sets, delivering high-quality drivetrain components for muscle cars, classic restorations, and modern performance upgrades.