8.25 ID?

Those are casting numbers, not stampings. Time and shift codes. What info do you need ?
Casting Numbers: Mopar Rear Axle Dimensions
Mopar Rear Ends / Differentials / Etc

Hey thanks,
Yep casting numbers, sorry.:D
I have seen both of those sites already, but was hoping something would tell me what year this thing was made.
Doesn't really matter when it comes right down to it, because I already know which range of gears this one can take and it already has the gears I wanted anyway.
I'm going to cut it down to the Dart length and make a disc brake unit out of it.