8.2 Buick Pontiac 3.55 Ring & Pinion

The Motive Gear 8.2 Buick Pontiac 3.55 Ring & Pinion is a performance-grade differential assembly designed for GM 10-bolt rear axles requiring precise gear ratio control and load-carrying reliability. This 3.55 ratio kit delivers the mechanical foundation necessary for vehicles demanding balanced acceleration, highway cruising efficiency, and repeatable power delivery under sustained driving conditions. The 27-spline pinion design ensures solid engagement with corresponding driveshaft components and minimizes slip during torque transfer.

Constructed as a complete ring and pinion kit in BPO-style configuration, this assembly eliminates guesswork during installation by pairing matched components engineered to OEM specifications. The 3.55 gear ratio sits in the middle of the performance spectrum—lower ratios favor highway economy and reduced engine rpm at cruise, while higher ratios sacrifice fuel efficiency for increased low-end torque response. For 8.2-inch axle housings, this ratio provides a practical middle ground suitable for street-driven vehicles where both acceleration and fuel consumption matter. The kit's 13.44 lb shipping weight reflects the solid steel construction required for reliable torque handling.

This assembly is engineered for owners of Buick and Pontiac models equipped with 8.2-inch GM 10-bolt rear differentials seeking to replace worn gearing, upgrade to a different ratio, or restore original specifications. Installation requires proper setup procedures including gear lash adjustment and backlash verification to ensure long-term durability. Buyers should confirm their specific vehicle's axle type and current ratio before ordering, as incorrect ratio selection can result in improper fit or performance mismatches. Motive Gear ring and pinion kits are recognized in the automotive aftermarket for maintaining tight tolerances and consistent engagement characteristics across production runs.