I don't drain the transfer case, I drain the transmission, because the ax15 will piss about a quart out the back if you don't. NSG is sealed back there so no issue for you. I forgot that difference between them so yeah if he splits them, he will not need to worry about it since he also has the NSG.On my 2005 I dropped the NSG with my brother. I'm sure there's more than 1 way but for me:
1. Took off the Transfer case. I certainly don't remember draining either Trans or TransC fluid like @machoheadgames did, it's been a year and a half, so I've killed a lot of brain cells with bourbon.