I can’t stand working on differentials. Nasty, stinky used gear lube smell that sticks to everything and takes days to wear off. Also, once to disassemble the rear end and install the differential, you’ll need to establish the correct ring and pinion tooth contact pattern and gear backlash with shims and/or a crush collar located on the pinion gear. Might as well replace all the bearings while you’re at it too. You might need a .001” dial indicator to measure the backlash with. Pay someone. It’s a PIA.