3 " Lift question ( newbie)

No simple way to block the front. You can get about 2inches from adjusting the torsion bars but that's it.

Adjusting the torsion bars for lift will give you a very rough ride. If you are going to lift it do it right and buy a suspension lift or build a custom one.

Where's a good place to buy a lift kit. I'm looking for a 3-4 inch lift. What brands are good and what all will I need

I have been doing research and I think if you get 2" shackles and an add a leaf you get 4" in the rear but I have found 3" for the front with after market keys

there is no actual lift kit for Durangos 2000 - 2003. all you can really do for the most lift is either have it custom made or get new 3 inch lift torsion keys for the front and then the 2 inch shackles and a 1 1/2 inch add a leaf kit so youll get around 3 inch lift all around then a 3 inch body lift if ya wanna fit bigger tires