Older Chrysler third memeber case numbers

Slantsix64 said
hi guys I'm trying to find out the older Chrysler third member 8.75 case numbers, I know of the newer ones 741 742 489, but what are the older gears case numbers the ones that cam with tapered axles

I have a 64 with the tapered axles. its a 741 case. the 741 case dates back to the original 8.75. So MOST of the tapered ones are likely to be 741s