yeah I mean you did have a hard time with the birf elim kit.. and my buddies truck hops like no other and he never broke em so I don't know. But my buddy cody, his login is coods he has the datsun and he's broken like 5 27 splines but he rallies hard core...but they send them super quick just sucks taking the axle apart. I would just run them untill you get tired of breaking them if you break them and then just sell them and buy 30s... Since they have a lifetime warantee there re sale value is pretty damn close to new.