There is always the unforeseen, but i can't think of anything else right off hand. Just make sure that when you reset your pinioin preload that you DO NOT exceed the torque spec. If you do you will have over crushed your crush coller and then you'll need to put another one on there. Not too big of a deal; you just don't want to have to go through the trouble of installing a new one.
Also, when doing this, go ahead a pull the pinion support off the housing and check the pinion preload before pulling it apart. You may want to use that number on re-assembly (if it has a preload still).