I drove about 1,200 miles on a recent road trip. After about 600 miles to the destination I started getting a noise right at 40 mph, with a slight vibration. It starts at 40 and then continues up until highway speed. Constant slight humming, depending on vehicle speed, not RPM. For some reason it is way more prevalent at 40 MPH than 70 MPH. It almost sounds like the tires are humming or a bad wheel bearing. It will make noise at 40 MPH even if I am in neutral. If I am going 40 MPH and turn sharply right to unload the passenger front tire it will stop. I could have sworn it was the wheel bearing so I changed out both fronts today. Was super disappointed when I finished, took it for a ride, and noise was still there. I also rotated the tires, no change.
Before I went on the road trip I did change out the transmission fluid. Pump out style from the tranny cooler. I have done this before on my 3rd Gen 4Runner so I am familiar with the process, it went smooth. I also changed out the passenger side CV axle as well. I have already tried installing another passenger side CV axle so I believe I ruled that out already. Also I had no noise when I left for the trip, only when I got there it started.
What else can I check here, it is driving me crazy. It is possible that it may be the tires, I thought that by rotating them there would be a change but I can't tell if there was a change. I have Cooper discoverer AT3 4s tires, one size up from stock.
Before I went on the road trip I did change out the transmission fluid. Pump out style from the tranny cooler. I have done this before on my 3rd Gen 4Runner so I am familiar with the process, it went smooth. I also changed out the passenger side CV axle as well. I have already tried installing another passenger side CV axle so I believe I ruled that out already. Also I had no noise when I left for the trip, only when I got there it started.
What else can I check here, it is driving me crazy. It is possible that it may be the tires, I thought that by rotating them there would be a change but I can't tell if there was a change. I have Cooper discoverer AT3 4s tires, one size up from stock.