my buddy on is drag s13 run is s13 punking but all the rest is r32 gtr : diff inside , out-put shaft , axle and i even think he runs r32 bearing (but the bearings im not sure)
never broke and axle in is life ... but the drive shaft ripped in two and almost cut is right leg off
http://www.youtube.com/watch?v=CoX1nJu2Dgc