I was running a 3/4 ton rear end for many years, and my solution was to make a 6 stud to 8 stud adapter plate that just bolted on to the 1/2 ton hub. I looked seriously at adapting the 3/4 spindle to the 1/2 ton axle, but decided against it because I felt that it would be too difficult to get the job done accurately.
Bob
