I think I know the answer but ill shoot anyhoo, all 4X4 Vehicle's I have ever owned all had Manual Hubs (Warn Actually) Old 70 or earlier Jeep PU, Power Wagon Datsun 4X4 etc.
This 2000 Durango is the first where the front end is Live No matter is in 2H, N, 4 Low etc. Lot of extra wear and increased fuel use is there anyway to install locking (Manual Hubs) on this specific Vehicle without installing a solid front Axle unit or some other crazy Modification??
2000 Durango 5.9 SLT Plus, Shift-on-the-Fly,231HD Transfer Case ,205MM Front Axle
I imagine the answer is im SOL but never know unless I ask.

 

You would spend more doing the conversion, than you would save in gas/repairs, even if you drove it another hundred years. I am not aware of any kits for the conversion, using the IFS front end..... and SAS conversion would present issues/costs all its own.

 

Ya thought as much thanks again,