Richmond Gear 831021B Ring and Pinion Installation Kit, GM, 10-Bolt, 8.5 in. Diameter Ring Gear, 30-Spline Pinion, Kit. Please Click on the "Read More" link for additional details about this item. Thank you, Summit Racing Equipment. The World's Speed Shop Since 1968 Summit Racing Part Number : RMG-831021B Please hover mouse to enlarge image Richmond 831021B Ring and Pinion Installation Kit 10-Bo Axle Bearings Included No Axle Seals Included No Carrier Bearings Included No Carrier Shims Included No Cover Bolts 10 Cover Gasket Included Yes Crush Sleeve Included Yes Differential Case Design Type GM 8.5 in. Head Bearing Included No Notes. Fits car applications. Pinion Nut Included No Pinion Seal Included Yes Pinion Shims Included Yes Pinion Spline Count 30 Quantity Sold as a kit. Ring Gear Bolts 10 Ring Gear Bolts Included No Ring Gear Rotation Standard Tail Bearing Included No