So I have a 1998 Jeep wrangler Tj (170,000 miles), and I'm running into a issue after I bought it used. When I got back home, started it up and drove down the road the next morning, there was a higher pitched whine coming from what is sounds like the front end at 35-40mph and above. The pitch gets higher when speed is increased. It's definitely prominent. Seems that engine rpms have no effect on it. 4wd doesn't seem to effect it either. There was fluid in the front diff. It has a 4in lift. (Not sure if that helps any) Check for play in wheel hubs, seemed fine. Noise didn't change when braking suddenly, or turning sharply left and right. If there are any questions, please let me know. Any help would be great.
Here's a video of the problem
Here's a video of the problem
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