f77 front axle clonking

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hi there ive got a axle prob and im baffled. a clonking noise happens on drivers side front when im steering left or right . it only does it when im in 4 wheel drive . in 2 wheel drive it dead quiet. i assumed the cv joint . i got a new one from milners and put on . just tried it and its still clonking . comming from around the hub area . its a loud clonk that i can easy hear when im turning and got window open . if i go real slow and steer to left or right i can hear it go clonk clonk all the time about every second or 2 . but it dont do it in 2 wheel drive . help please!!!!