M:

Can you determine if there is a separate outer race pressed into the main drive gear, or if the ID of the main drive is ground to form the race?
There were a few applications of the Borg Warner/Tremec T-5 that had a similar tapered bearing at that point ("Cobra Pocket Bearing"). All the other T-5s had a bearing setup that matches the Getrag explosion (needle roller + radial needle thrust bearings).
There is a chance, albeit a very remote one, that the T-5 tapered bearing would match.