[Scrapla]

Well I got to the plug but I cant get it off I also couldnt get the best grip on it but what would cause it to seize, also I had my 3:73s put in about a year and a half ago and the fluid and gasket was changed and was fine up to about a few months ago I was thinking he used a air rachet to tighten the plug and thats why but if it is seized what do I do and if the rear diff is almost empty what are signs that its gonna go out on me since this is my daily driver and its on the highway 5 days out of the week.