If memory serves me right, there is a difference in the internals sizes of the axle's between the 3/4/and 1 ton axles, even though they are both 14 bolt axles. ( I believe the bearings and races are bigger in the 1 ton ), so I believe you have to swap out the whole axle.
Give it some time, someone else will either correct me or confirm my memory.
Also I see this is your second post, Welcome to the site.