4x4 problem

i have a 99 dodge 4x4 quad cab and the front passenger seal went out i changed that but at the same time i started getting noise coming from the front i have good steering no vibrations and good brakes but the noise
comes and goes going down the road if i put it in 4 wheel drive it quits and am also able to put in 4 wheel without putting it in neutral it all started with the seal leaking could dirt of gotten in vacuum line or canister? please help

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