3.73 7.5in 10 Bolt GM

The Richmond 3.73 7.5in 10 Bolt GM ring and pinion kit is a precision final drive assembly engineered for GM 10-bolt differentials. This 3.73 ratio gearset delivers the balance between acceleration response and highway cruising efficiency that modern off-road platforms and performance vehicles demand. Richmond is recognized for manufacturing tight-tolerance ring and pinion sets that maintain gear mesh integrity across thousands of operating hours, making this kit a core rebuild component for serious powertrain work.

The 3.73 ratio represents a moderate numerator that preserves fuel economy on highway stretches while providing meaningful torque multiplication off-line—critical for vehicles running larger tires, towing loads, or operating in low-grip terrain. The 27-spline pinion interface is the standard for this differential housing, ensuring drop-in compatibility with OEM and performance applications. Weighing 12.75 lbs, this complete kit includes matched ring and pinion gears sized for the 7.5-inch and 7.625-inch differential carriers common to GM 10-bolt platforms used in full-size trucks and SUVs from the 1970s through modern production runs.

Buyers performing differential service, rebuild, or upgrade work on GM vehicles—whether for daily duty, ranch operations, or weekend trail use—will find this gearset the foundation for a properly functioning final drive. Installation requires the bearing preload, backlash, and pattern-check procedures outlined in factory service manuals; this is not a bolt-on component and should be installed by technicians with differential experience or factory-level reference material.

Richmond's reputation for close tolerances and quality control makes this 3.73 gearset a trusted choice across restoration shops, performance builders, and fleet maintenance operations. The MPN 49-0046-1 identifies this specific ratio and housing configuration, ensuring correct specification before ordering.