What A-body did this 8 1/4 come out of?

If it was from a 1973 duster 340 car it would have had 3.21 gears in it....not 2.45....As stated the jeeps had 8-1/4 rears but usually they had 3.55 gears in them....The gears could have been changed over the years though.....Not sure of the brake size on the jeeps