Differentials are pretty straightforward. 60,000 miles is a pretty good interval.

As you have an x-drive model, the transfer case uses a special BMW fluid. When it is changed, there is a reset procedure for the transfer case control unit. A service computer is required to do that reset. 60,000 miles is a pretty good interval for this compartment as well.

Yes, there are lots of threads here about changing these fluids. A search will show them. Search on the full site, not just the E70 forum.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue