I have a chevy 4x4 1/2 ton it has a ow noise in the frontend when it in 4 wheel drive .It had the noise when I first got it then I lost the rearend so I changed both front and rearend .and it still has the noise.The only thing that I have not done is change the springs. I'm open to any suggetions.

It could be springs, sway bar, ball joints, or steering linkage that could be doing it. Check all those and if it continues, I'd take it to a mechanic cause it could cause a wreck if something breaks.