GM 10-bolt (8.5", 8.6")

GM 10-bolt 8.5" and 8.6" ring and pinion sets cover popular half-ton and SUV rear axles. Ratio choice affects towing, highway RPM, and crawl speed — common upgrades include 3.73, 4.10, and 4.56 when fitting larger tires.

Confirm 30-spline shafts and carrier style. Use a matching installation kit and set backlash and pinion depth to spec for quiet, durable operation.