I'm going to assume your discussing the axles from a 8 3/4 or is it a Dana 60 with the 30 spline axles? Either way all the current after market axles for the 8 3/4 and Dana 60 with the 30 spline axles use either 30 degree or 45 degree, I'm not sure which is correct Originally Mark Williams used the other non stock angles on his axles and spools but discontinued doing that a long time ago due to customer input according to one of the techs. when I ask him about on their current spline angles several years ago