GM 8.5" and 8.6" 10-Bolt Performance Ring and Pinion Engineered to out perform the competition! These Ring and Pinions are the finest made for the GM 10-Bolt Rear End. The following treatments in production make the difference between this brand and all the others in the market: • CNC Throughout • Computer Controlled Heat Treatment • Index Tooth Spacing • Central Contact Pattern • Cutting Edge Lapping • Easy Set Up

SPECIFICATIONS: • RG DIAMETER 8.5"" • 10 7/16" X 20 LH THREADED RING GEAR BOLTS • PINION DIAMETER 1.625" 30 SPLINES • CASE BREAKS 2.56/2.73 • AXLE SPLINE COUNT 28 OR 30 • 10-BOLT COVER