If you upgrade to 35 spline stubs with flages, and run a 84 and prior Dana 60 the next thing to break will probably be your innershaft. If you have the 85 and up shafts and 35 spline outers, the next thing to break will be your u joints.
Either way 'sumthin' is breakin' but id MUCH rather not break an inner shaft and but a worse shock load on my detroit.