My buddy has been running a d35 of 35's for 3 years with a 4.0 locked. Never broken a rear shaft.
Has taken out alot of the 260 join shafts, until he finally went one piece with 297 joints
My d35 is locked and trussed, ive only had it out once but I beat on it pretty godo with no failure yet.
But dotn get me wrong an 8.8 is in my future becuase I need to regrear and a 4.10 disc 8.8 is $100 at the local yard, so it makes more sense.