There should be some kind of bearing retainer, a bearing/race, and some sort of shim to fit in the housing and a seal.
The first to go on the shaft, on the bottom when the splines are in the air and the flange is on the ground, is the bearing retainer, then the brake backing plate, then the bearing, then the race, then the shim, or shims. The shim will probably be a round block. The seal is pressed to the back of the housing,CAREFULLY. Then the whole thing goes in, the four bolts on the bearing retainer bolt to the axle end. Lube the seals with some oil to prevent burning them up before oil can reach them.
Hope it helps I've taken a few apart to fix them, and install them. Any more q's write Me. Good luck.
'84 CJ-7, 6" lift, 33" BFG's, I6, .030 Over, Comp Cam, 400cfm Weber, K&N, T-18, 4 Core, Snorkel, D60 Detroit, Custom CV Driveshaft, 1350 U-Joints, D30 True Trac, Alloy shafts, S.R.S. w/ buggy springs, Custom Folding Shackles and Spring Hinges, Custum Tire Rack, Designed On Board Air, Optima's. Sneaky Jeep Owner #3.