1) Can any centre section type be swapped into the housing?
Yes
2) Say I want the better 742 or 489 centre section. What is required for the swap?
Nothing. But due so note the size of the U-joint to be used. Theres basicly 2 sizes that can be used. Lakewood has a "Cross over" U-joint that has the smaller size on one side and the larger size on the other side.
Thanks:burnout:3) I'm assuming the axles will need to be swapped out for this as well?