ATR: Ya I read it, just keep it in area51 for now

The guts (spider gears) should fit

Hey I put a limited slip out of an 85 in my 80 and it works great. I also has the disc brakes so now 4 wheel disc. The only mod was the input yoke and the driveline end plate. There is an issue about the later and earlier 85 rears in that they changed the brakes and rotors to a bigger one later in the year. Sure like the limited slip, it goes really good in the snow.