Cutting and respling Axles?

I have a E body 8 3/4 housing I have shortened to A body size. I have now come to the Axles. I am sure you cant cut down a E body axle as under the spline there is about 1.5 inches of taper before it gets wider again and the A body length falls right in that tapered area. Am I correct in thinking that the only soloution is new axles?.