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EXCEL 12BT373 Differential Ring & Pinion for GM 8.875' 12-Bolt, 3.73 Ratio, 30-Spline, 11 Pinion & 41 Ring Tooth Fits Chevy & GMC, Blazer, Suburban, Jimmy (1964-1982) –Replaces, USA Standard 36175

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$144.08

$ 71 .99 $71.99

In Stock
  • ✅ Precision Fit for GM 8.875" Truck Differentials: Designed specifically for GM 8.875" truck differentials, this EXCel by Richmond Ring and Pinion Set ensures perfect compatibility and performance for Chevrolet and GMC models with a 12-bolt cover.
  • ✅ Optimized 3.73 Gear Ratio: With 41 ring gear teeth and 11 pinion teeth, this set provides a 3.73 gear ratio, offering an ideal balance of towing power and highway efficiency for light-duty applications.
  • ✅ Precision Engineering: Featuring a 1.438-inch pinion shaft diameter, 30-pin spline count, and standard gear rotation, this set ensures smooth operation and long-lasting performance.
  • ✅ Durable 8620 Steel Construction: The ring gear is crafted from high-strength 8620 steel, delivering exceptional durability and reliability, even under demanding conditions.
  • ✅ Comprehensive Warranty Coverage: Backed by a 1-year or 50,000-mile warranty, this product guarantees quality and peace of mind for drivers looking to upgrade or replace their differential gear sets.


Product Overview

Upgrade your GM 8.875" 12-bolt differential with the EXCEL 12BT373 Ring & Pinion Set. Engineered with a 3.73 gear ratio, this set balances power, efficiency, and reliability for classic Chevrolet & GMC trucks and SUVs.

🔹 Features & Benefits:
  • ✅ 3.73 gear ratio optimized for towing and daily driving.
  • ✅ Standard rotation with a 12-bolt ring gear design.
  • ✅ 30-spline pinion with an 11-tooth pinion gear for smooth torque transfer.
  • ✅ 41-tooth ring gear made from premium 8620 steel for high durability.
  • ✅ Direct fit for GM 8.875" truck differentials requiring a 3.73 & higher carrier.
🚗 Application & Compatibility:

✅ Fits Chevrolet & GMC Vehicles:

  • Chevrolet C10, C20, K10, K20, Blazer, Suburban, G10, G20, P10, P20 (1964-1982)
  • GMC C15, C25, K15, K25, Jimmy, Suburban, G15, G25, P15, P25 (1964-1982)
🔄 Replaces For:
  • ✅ USA Standard Gear: 36175
  • ✅ Richmond Gear: 49-0280-1
  • ✅ Transtar Industries: 742J730C
  • ✅ Motive Gear: GM12-373, GM12-373A
  • ✅ Richmond Gear: SGM12T04
  • ✅ USA Standard Gear: ZG GM12T-373
🛡 Warranty & Why Choose EXCEL from Richmond?

Backed by a 1-year or 50,000-mile warranty, the EXCEL 12BT373 Ring & Pinion Set is engineered for durability, precision, and smooth performance. Choose EXCEL from Richmond for premium differential gears designed for classic GM trucks.

Upgrade your GM 8.875" 12-bolt differential today with EXCEL’s high-performance 3.73 Ring & Pinion Set! 🚗💨

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