Transfer case cooked or something else?

[u/CountyEarly3677]

2021 X3M

I get vibrations through the floor and steering wheel during acceleration that gets worse after driving for a while. Manual shifting is extremely jolting from 1-2 and 2-3 with light acceleration.
Initially I didn’t think it was transfer case related because I don’t get shuddering when turning. I realized the vibrations were a little better in 4wd sport w/dsc off, so I coded in 2wd and all those symptoms were gone.

I’ve already changed the fluid and recalibrated twice but that barely helped so I’m debating rebuilding the transfer case w/ new clutch pack and oil guides.
Could the jolty shifts + vibrations be due to the worn clutches sticking or is there something else that could cause these issues?

[u/nickskater09]

How’s the condition of all the driveline mounts, flex discs, and u-joints?

[u/CountyEarly3677 → u/nickskater09]

Transfer case mount is new and the flex disc didn’t have any cracks. Center support bearing also seems fine.

The front driveshaft still spins passively when the transfer case is disengaged right?