Plain-old GL-5 hypoid gear oil, typically 85W90 weight. Oddly, Haynes calls for 140 wt (typically 85W140 today). I'd trust the owner's manual for the weight, if you have one.
But I likely wouldn't even look it up - I'd put in 85W90.
You need the friction modifier. It comes in a tube that you squeeze in before you add the oil. Some brands of oil say "limited slip compatible" and you may be ok with that. But they often chatter without adding some modifier. Try it without if you want. If it chatters, add some modifier.
1) '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps. 2) '82 J20 360/T18/NP208/3.73, KOs, 7600 GVWR 3) '75 CJ-6, 304/T15, PS, BFG KM2s, soft top 4) '95 VW Golf Sport 2000cc 2D