The JEGS 555-600109 ring and pinion is a direct-fit 3.23:1 gear set for the GM 8.5/8.6 in. rear axle. The ring and pinion are precision cut and lapped as a matched pair for correct tooth contact, quiet operation, and dependable power transfer through the differential.

JEGS 555-600109 GM 8.5/8.6 in. Rear Axle Ring and Pinion Features:

• Fits 1999-2017 Chevrolet and GMC 1500
• Fits 1970-1981 Chevrolet Camaro and Pontiac Firebird
• Fits 2006-2010 Hummer H3
• Fits 1999-2013 Cadillac Escalade
• Fits GM 8.5/8.6 in. rear axle
• 3.23:1 gear ratio
• 42 ring gear teeth and 13 pinion gear teeth
• 30-spline pinion
• Standard rotation ring gear
• 8.500 in. ring gear diameter
• 1.626 in. pinion shaft diameter
• Precision cut and lapped as a matched set

JEGS 555-600109 GM 8.5/8.6 in. Rear Axle Ring and Pinion Notes:

• Requires a 2.73:1 or numerically higher ratio carrier
• Ring and pinion only; an installation kit is not included
• Crush sleeve, bearings, shims, pinion seal, pinion nut, and ring gear bolts are sold separately
• Professional installation is recommended; correct backlash, pinion depth, and bearing preload must be set during installation
• Follow a proper gear break-in procedure to maximize gear life