4wd help

I have a 2002 dodge Durango 4.7l with 4wd high/low option. when I put the truck in park and throw on 4wd high it will make a sound. I am guessing the clicking sound is the 4wd engaging(the noise lasts for about half a second). Then I put it in drive and move a few feet going slow and the truck just stops fast. I did hit the brake because I was turning into a driveway. So now that I am stopped and still in drive I hit the gas and the truck doesn't move at all. I put it in reverse and it goes backwards. I stopped put it in park then switched to 2wd and proceeded and a clicking noise came on for about 5 seconds then went away. I am not sure why this is doing this but could anyone give me any ideas?

You might get better, more detailed, support if this were posted in the Durango forum. Would you like me to move it there?

-Rod

it's the torque converter or a locked down front differential