... Depends on who did the work...The final drive shimming is pretty critical and requires proper measurement to do so. If the rebuilder simply replaced the crown bearing and put the same shims back in, then it also may rear its ugly head at some time in her future...
I've heard of a FD failing 18K after a "rebuild" which was essentially a bearing replacement.
I've always assumed that a bearing replacement would probably last about as long as the first bearing lasted, all other things being equal. "All other things being equal" assumes that the replacement bearing was not damaged during install (which isn't all that hard to do.)
A quote from an earlier post: "After tightening the case all the way, I spun the output, and it was VERY tight. Clearly shimmed too tight. Took it back apart and put a thinner shim in. This time, after reassembly, it spun very nicely."
Whenever I read a post like this that suggests the preload bearing shim was adjusted by the "feel" of how hard it to turn the final drive output after assembly, I cringe. There is no evidence that feeling rotation resistance by hand has any value in assessing for proper preload shim thickness at the crownwheel bearing.
I rebuilt more that 50 final drives, and during the last half of those rebuilds, I was comparing the DMAN dial indicator method to the BMW Service Manual method. I found that I would get essentially the same results for shim thickness using both methods. Without exception all of the rebuilds I did of drives that had a "classic"crown wheel bearing failure, the replacement shim(s) thinner than the original shim(s). I posted many of those findings on this site over the years.
After reassembly of those drives with the new, thinner shims, I found that they would turn hard by hand, none of them spun easily. I suspect that any assembled final drive that spins easily is under shimmed.
In summary, that an assembled final drives is hard to turn by hand does not mean that it is over shimmed.
I hope that the original poster does not feel criticized by my comments, rather, I just hope that after all I have written about rebuilding final drives on this site, that folks don't start assuming that you can properly rebuild a final drive by feeling the resistant to rotation of the assembled drive.