Just attempted this service last night. I wasn't able to get the trans case fill plug off. I only had a socket Allen wrench and it didn't cut very easily. I loosened the support bracket and pushed it back 1/2-1" but it wasn't enough. I ended up just sucking out what I could with my fluid transfer pump. Same for diff (there is no drain plug, stupidly). Both were below the full level by a good bit (1"?). The fluid I removed was amber, not clean but not dirty. I was able to get 1/2 liter of new fluid in each so I feel good. Better than nothing. I used Liquimoly GL5 75w-90 for both transfer case and rear diff.
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2012 X5 35D - EGR delete and Stage 2 tune
2003 M5 - Imola/Caramel, Dinan S2 suspension, Alpha-N tune
1990 M3 - CF Airbox, Alpha-N, Schrick 284/276 cams, VAC S2 head, full GC suspension
1991 M5 - Black/Black - stock
1991 325iX - Winter beater
Retired: 1999 328is 5MT, 1994 525i 5MT, 2003 530i 5MT, 2012 X3, 2006 325i 6MT, 2001 M5
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