N63 Transmission, TC, and Diff Fluid change

[blackhatal]

Hello everybody,

I have a 2012 X5 50i that's close to 100K miles and has never had the transmission, transfer case, and differential fluids changed. I've searched for some DIY's but all of them seem to be for the 35d or 35i models. I know the diesel used the 6HP transmission and the 35i has the 8HP, but is it the same version of 8HP (mechanically) as the one in the 50i? Are there any substantial differences in parts or labor between these? A local indy that specializes in BMWs quoted me $400 for TC fluid change and adaption and close to $1000 for transmission fluid change. He also said diff fluid changes are not necessary...
So I'm thinking I could DIY this.