Motive Gear GM75390 Ring and Pinion Gear Set 3.90 Ratio GM 7.5 Inch 10-Bolt

The Motive Gear GM75390 is a precision-engineered ring and pinion gear set designed for GM 7.5-inch and 7.625-inch 10-bolt rear differentials. This high-quality gear set features a 3.90:1 ratio, providing an excellent balance of acceleration and torque for street performance, towing applications, and oval track racing.

Key Specifications:

• Gear Ratio: 3.90:1 (39-tooth ring gear, 10-tooth pinion)
• Ring Gear Diameter: 7.5 inches
• Pinion Spline Count: 27 splines
• Pinion Shaft Diameter: 1.438 inches
• Ring Gear Bolt Configuration: 10-bolt pattern
• Material: Premium 8620 alloy steel
• Rotation: Standard rotation
• Carrier Break: Fits 3.23 ratio and higher carriers

Features and Benefits:

• CNC-machined from premium-grade 8620 alloy steel for maximum durability
• Precision heat-treated to increase core strength and surface wear resistance
• Engineered for smooth, quiet operation and reduced vibration
• Ideal for restoring performance after installing larger tires or for improved towing capability
• Designed to meet or exceed OEM specifications
• Compatible with Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, Oldsmobile, and Pontiac models (1973-2013)

Cross-Reference Numbers:

• Motive Gear Performance: G875390
• Richmond Excel: GM75390
• Richmond: 49-0284-1
• Nitro: GM7.5-390-NG

This ring and pinion set is backed by Motive Gear's reputation for quality and precision manufacturing. Professional installation with a complete bearing kit and proper setup is strongly recommended to ensure optimal performance and longevity. The gear set does not include bearings, seals, or installation hardware, which should be purchased separately.