833 question

75 and early 76 A-body OD were cast iron. The cast iron ones also can be identified in the vehicle because the slip yoke is the large 833/727 type.

After they went aluminum they are more commonly found with smaller 904/3 speed slip yoke.

I also have a cast iron 75 A-body OD and they are some tough ODs ....in fact they are preferred if you want strength and no countershaft bushing issues like the aluminum.

To be 100% sure you can count the teeth on the gears