An update on this an other things
First. let me tell you guys one thing (specially to those that are considering doing this on your own). If you live in snow states like me, plan on everything under the car to be REALLY stuck after a couple of years of salt. All nuts, screws, etc are going to be really rusted and hard to get off, unless you have good and appropriate tools.
Same goes for the wheel hub itself. Mine was totally stuck and really hard to get out, although you really don't need to disassemble it all as the manual says.
Other than that, I totally agree that it shouldn't need replacement at only 47 k and after I replaced it, my transmission went. Now thaaaat was not nice. US$3.2 k to repair at Aamco - they do repair the CVT's depending on what went wrong. Mine was the gear assembly (out of the CVT itself) so they managed to do it.
Not a very good sign of quality, as I have also found out on other Murano forums such as nico.org - that the first gen do have their share of blown transmissions way before 100k miles.
First Murano, 2004 Midnight blue SL AWD, loaded.
--> FIRST AND LAST - transmission does not see 50k miles? Not my kind of reliability.