Again, I'm assuming your axles are held on with bolts to the flanges. The tool fits an 8 or 12 point internal spline bolt head. Not sure which, not sure of the size (its not here to view). Also, when you do your flex coupling, to move the drive shaft forward, you need to loosen the large nut on the drive shaft. a pair of large adjustable wrenches will work, just a pain to get to.

Hanno