No idea what the problem is, but something doesn't fit.
T'was me, I'd take my digital caliper and start measuring stuff. Make sure the bearing and the transmission flange are the right size.
Personally had an issue measuring bearing reactions on the first Ohio class submarine. We use a hydraulic jack (with pressure gauge) and dial indicators to lift the shaft. Results were NOT what was expected and pointed to an obstruction inside the thrust bearing. Took apart the thrust bearing and found an oil seal that didn't fit. One surface was as cast - hadn't been machined. GE got the bill for that mistake.
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