If you need to pull the driveline to change the carrier bearing, have at it, but you would see motion if your tranny was working. The likelihood of catastrophic driveline failure without any prior noise or indication is low. The simple working pressure test I suggested will point you in the right direction on the tranny.

The 722.1xx TC has very slender "fingers" that like to shear off in the front pump. I bought my W116 300SD with that condition and there are other reports of this happening (after 30 years- go figure!) on this forum.

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