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Describe the sound and what you must do to hear the longest and loudest?
Does swerving effect it?
Does turning and taking off from a stop make it occur the most?
Alright. Think what you have is an Integrated Wheel End noise. It's more of a rattling type grind, right? The 4x4 system uses vacuum to disengage the front "hubs" from the axles. When there is not enough vacuum to pull the IWE off the axle, it drags, making a grinding type rattle noise. There is a IWE solenoid on the firewall behind the battery. These failed frequently due to water contamination. You will need to see if there is vacuum going to the hubs.
Really? On the backside? There should be the brake hose, abs wires, and vacuum lines held together with clips on the brake hose. The vac line is one line made up of two lines, one with a larger diameter than the other. You compared to other side? Who did the wheel bearing?
If there is no vacuum through the solenoid, it will need to be replaced. The new one has a "hood" on it to prevent water intrusion. Once good vacuum is regained to the hubs, drive it to see if your noise is gone. If you have good vacuum to hubs and still have the noise, that hub is no longer sealing and will also require replacement. Good luck and you can reach me using this thread if required.