I have a 742-case sure-grip 8.75 rear end from a '69 Dart. Assuming everything is original (yeah, yeah, I know...) would it have had 1.8" or 2.0" bearing journals?
742 case with original power-lock sure grip ( clutch type ) has 1.800 carrier bearing journals uses bearing/ race 25590 /25520 -- if a late 1969 and up sure grip ( spring type ) was installed bearing journal is 2.000 uses bearing/ race LM 104949 / LM 104912