I think it will be fine. Mabey have the new one magnafluxed shot peened or something. I have ran them in similar apps and have been running in daily use with no problems. The LU shaft is a bigger diameter than the non LU shaft but it does have as hole in it. It should work out to them being about the same and mabey even a touch stronger on the non LU but I am sure there could be a huge debate about that. Many guys are running stock input shafts on strong motors and it is just not a typical weak link