Raise rear of vehicle, support with jackstands under frame rails. Remove rear wheels. Disconnect driveshaft, ABS sensor, parking brake cable, vent hose fitting, brake lines, axle vent tube, and rear brake hose. Remove rear brake calipers. Support rear axle with floor jack(s). Remove lower mounting bolts for rear shocks. Remove nuts and U-bolts securing axle to springs. Lower axle and remove. Reverse steps for installation. Tighten U-bolt nuts and caliper mounting bolts. Check and fill axle with specified lubricant if needed.