The 8 1/4 thread

Seems like the bearing size is a crap shoot, If you are using the carrier that was in the rear and just changing gears no worries. My 74 was supposed to have the smaller 2.8? OD bearing and it had the 3.2? OD bearings. The ID is the same on both bearings. I use a pick to adjust the side bearing play myself, I made a tool and it is really just a PIA.