Without sway bar connected, you shouldn't be getting tires off the ground. The absence of a diff lock though hasn't kept me from going places that you may well pass on. I really don't find it any trouble.
We all need to keep calling/emailing places like highlifter and requesting this stuff and maybe they will put one out!
Cant say I needed it but I would buy it!!
I really don't understand why no one has made a locker for the 500. I think the 500 is selling great and people love them. There's a huge market for the 500 and a lot of upgrades for them could be made.