BBP swap, 65 Barracuda
Yeah, pretty pricey but if I can’t find any yards with GC’s or Liberty’s it might have to do.
Edit- found a local yard that has a 1998 GC complete rearend for $250. They don’t sell parts so hopefully one will have an LSD.
I’ll just need to make sure it’s a Dana 35, which is compatible with 8.23. The Dana 44 in my ‘98 GC 5.9 Limited has the Dana 44A. I think the 35’ came in the 4.0 models.