442 had a granted somewhat kludged but nonetheless 8.5 3.73 from the factory. Appears I have perhaps a S-10 SAE center with metric tubes and drums instead of all metric. Since I am converting everything else on the car to SAE as I go (almost everything under the hood already is) so having the SAE center is actually a good thing and the drum to disk out on the ends converts everything out on both ends plus going to 1/2-20 studs.
Per a couple pages back, I discovered the internals were junk just trying to put a decorative cover on the factory 3.73 (LOTS of metal came out with the fluid). So, Eaton Truetrac, Moser 30s, 1350 U-joint 30 spline yoke (I have been nervous about those tiny u-joints and yoke caps since I put the big block in it anyway), and moving to 3:42 gears while I am changing everything which should work better with the big block. Then the drum to disk conversion will all be easier while it's out on the bench too (or should).