I found an easy way to set the third member assy in the housing without messing up your gasket maker. Take a couple of old 6.0L head bolts, lop the heads off and thread them into the housing, as they are the same size. This will provide you with some nice dowl pins. I actually did my last one on the lift with the truck in the air. I used the cherry picker and a chain and lifted up to the rear end housing and let it slide down the dowels I made, into place with ease.