Documenting the parts that are going in the rear end...
Eaton Posi Performance Differential19556-010 - Limited Slip, 30-Spline, GM, 12-Bolt, 4 Series
Yukon Gear & Axle Master Overhaul Kit YK GM12/14068 - Ring and Pinion Gear Installation Kit, Master Overhaul, 30 Spline, GM 8.875 in
Yukon Gear & Axle Bearings AK 1559 - Axle Bearing, 2.530 in. O.D
Yukon Gear & Axle Ring and Pinion Sets GM12T-373/24128 - 3.73:1 Ratio, 1.438 in. Pinion, 30 Spline, 8.875 in. Ring Gear, GM 8.875 in.
Yukon Gear & Axle Differential Pinion Yoke GM12-1350-F/41069 - 1350, 30 Spline, Forged Steel, GM, 8.875 in
B&M Differential 71504 - 12-bolt, Aluminum, Black Anodized, GM 8.875 in
Not for the rear end, but these need to go with the trailing arms to be painted. Goodmark Parking Brake Bracket GMK414351967 - Cable Bracket, Includes Hardware, Left or Right