No need to drain the rear as the center section dosent come out.Installed the Moroso studs in my 65 and the kids 62 with newer rear end.You can actually install them by just knocking the axle studs out first.Then loosen the axle nuts and pull them out a bit.Install the new studs and use an old nut reversed with washers under it.Pull the studs thru the axle end and you are done.No press needed.On mine I needed to pull the axles all the way out so I used a deep well socket under the axle flange and the stud went in it and I just smacked them into the axle.Been 10 years and no problems.Did the same with the fronts.Rocky