I'm back ..but no news. I'm going to make a list of what everyone suggested and give it to her and tell her to give that to the dealer and say "fix it!" I'll still post new info when I get it. I think the tires are stock, I asked her how she puts it in 4WD and she showed me a button on the dash. I dont know - I have a 92 wrangler..mine has a stick to put in in 4WD.
Okay going by the thread
1) limited slip differential broken
2)speed sensor
3) differential gear additive
4)esp system
did I miss anything?