Contact Weddle. They are now prepping & servicing UTV trans & dif’s. And maybe they know someone in North County if you did not want to go to Weddle.
Sean at Weddle has posted on Instagram a XX trans & dif they serviced. The dif they added better bearings, deburr, shotpeen, Rem polish and shim to proper tolerances. I think he said a full prepped dif was $500ish.