Started in on the transmission swap, just ancillary parts for now since there’s no room to store the big stuff yet (wife’s car’s in the way!). During removal and inspection, found the likely source of the recent vibration that’s been noticing during acceleration. The rear engine mount plastic insert has deformed (squeezed out) enough to allow the two halves of the mount to contact metal-to-metal, hence the extra vibration. With more than 400 ft-lbs of torque, I guess I should expect this sort of thing. Going to have to redesign the mount but that can be treated as a separate project.