IF you find that your axle has a 3 bolt flange on the input to it, fret not cos they are actually quite easy to change an alll.
fashion a puller out of some nuts, a bolt and some spanners and a socket, pull the nose out the middle, un bolt the flange.
Get a 24 spline input flange, AND THE SPACER TO GO BEHIND IT and bolt it on! You will probably find that your old axle has only a 4 spline input on it.