Assuming you are ok with just a working rear end and no locker, You need a new carrier and spider gears to replace the locker assembly. I'd get one from a junk yard, maybe www.daveysjeeps.com
. Be sure to get the one for high number gear ratios, their were only two, crossing at 3.55 ratio I think. Once you have the new carrier in hand, yes, you can swap the ring gear to the new carrier, then you only have to set the backlash. Do Not touch the pinion, it's probably fine as is, just check the ring/pinion contact parch after you're done.