not sure exactly as this is an Orion transfer case out of a custom built rig. Rig is a 71 but not sure if has 71 parts on it. Supposed to be 16 spline. Added pics with ruler next to holes for measurements. Looks to be about 55mmx45mm. Any helps as to what year I should be looking for would be appreciated as well.
s after some digging I think this is a advance adapters flange to make it fit next to a 4l60e. Think i got a driveshaft side flange that will fit from guy I bought it from now just need to find out if it will go onto my cv joint for my 60 or is I still need one from a 40