Good question- I have no idea
Never ever seen any broken internals though, just one mangled cup and a loose bit of metal shim- tough diffs...
Bear in mind though that the slipperential uses a slightly smaller than normal set of internal bevel gears- like the crt .5 has or something of that nature, just incase you werent aware or were planning on using normal sized 1/8 internals ( unless Im trippin again ).