8 1/4" differential

Found an '80 or '81 LeBaron with an 8 1/4" axle in a yard. I have heard that the 2.45 and 2.2 gear-ratio rear ends had a slightly different/unique center portion of the axle from the 2.76 & up had on them. Not having much experience with these rear ends and cramped work space (low light), I could not positively ID the ratio until I pulled out the diff...2.2 ratio
Here is my question- is it possible to strip off the ring gear, swap on a 3.21 ring gear from a rear I possess, & use this sure-grip diff in my rear end? Or is this just an all-around fiasco:eye:?
Experience and knowledge appreciated