Hello,
I have a 2003 dodge Durango ext 4.7liter 8cylinder.I hear a loud clicking noise in the front end when turning while in 4 wheel drive when turning.

Any info would be helpful.

 

1) Assuming you were on pavement, don't do that. Regular 4wd is only meant to be used on slippery surfaces, snow, dirt, mud, etc..

2) That said, assuming you were following rule 1)... it could also be front axle u-joints/halfshafts that have not been used much if at all.