4.88 12 Bolt GM Pass

The 4.88 12 Bolt GM Pass by Richmond is a specialized ring and pinion set designed for high-performance applications where rapid acceleration and torque management are critical. For tactical vehicle operators or performance enthusiasts, this gear set provides the necessary mechanical advantage to move heavy loads or achieve quick off-the-line response. Utilizing a 4.88 ratio, this kit is specifically engineered for the GM 12-bolt rear end, ensuring a precise fit for vehicles requiring a 4-series carrier.

This Richmond Pro Gear kit features a 30-spline pinion and an 8.875-inch ring gear diameter, providing a robust interface capable of handling significant stress. The precision-cut teeth are designed to maintain optimal contact patterns under load, reducing heat buildup and preventing premature wear during intense operation. Because this is a Pro Gear specification, it is manufactured from high-strength alloys that prioritize impact resistance, making it a reliable choice for demanding environments where drivetrain failure is not an option.

Professional installers and fleet mechanics will find that the 4.88 12 Bolt GM Pass offers the exact specifications needed for a seamless rebuild of a GM 12-bolt passenger car differential. This kit is ideal for those seeking to optimize their final drive ratio for specific mission profiles, such as low-speed crawling or rapid-response scenarios. When you buy this Richmond gear set, you are investing in a component that meets rigorous manufacturing standards to ensure long-term durability and consistent performance in the field.