i have a 96 blazer that the front end makes a growling noise. i thought it was pass side wheel bearing and replaced it, still no change, replaced drivers side front wheel bearing, no change. the noise will go away once i put it in 4 wheel drive. could it be my front diff assy? has new tie rod ends, lower and upper ball joints, and new tires. please help. thanks, truck has 168 thousand miles

 

Does this sound like it fits:

4wd Front Axle Clicking When in 2HI - Goes Away when in 4HI/4LO