What offset or backspacing are you rims? That will be the biggest factor. Honestly, without knowing I'll say you'll run into issues rubbing in the front with a true 3" drop. That's speaking from experience and seeing many others having problems with it.

It's going to come down to the dimensions of your wheel/tire setup. If you're running a 20x8" rim with a 30mm offset then you may be fine, but if you run a 20x8.5 with a 12mm offset you'll probably run into rubbing issues.