[Old Truck Man]

3/4 ton rear ends have full floating rear axles. the axle has nothing to do with holding the hub to the rear end. the bearings & races hold the hub to the spindle. you can pack the rear bearings with grease just like you do the front ones. You have apparently ground off the bottom portion of the backing plate from dragging it. I would just remove it. so you will need the inner & outer bearings races and seal. be sure to properly adjust the bearings and lock the retainer securely between the two axle nuts.