I've looked through the other posts and I have a problem that doesn't quite fit.
I've got a 2003 Expy 4x4 with the 2H/AWD/4HI/4Lo tansfer case. It has 161,000 miles. Recently at highway speed (70mph) the left front wheel starting making an almost constant high pitched/metal to metal squeal. I was in AWD. I pulled off the road it made the noise at roughly the same pitch to 10 mph. The neither wheel was hot to touch. I got back on the road and it didn't do it for again for 45 minutes. The noise doesn't change if I hit the brakes or shift into AWD, 4HI, or 2H. There was a very slight change in pitch if a changed lanes. It would get better and worse for the rest of the trip and would usually get bit louder above 70.
I just got home and jacked up the front. Neither wheel has any back and forth motion if I grab and put force on the wheel from top to bottom and there is no noticable noise if I spin the wheel. The only noise from spinning the wheels is the gears in the auto hubs/CVs engaging for the first inch or two or spin (this sound seems normal). It appears as if the hubs are engaged in 2H with the engine running (is that the way its supposed to be?)
Anyway!? Is this the front unit bearing or something else? I have $600 worth of bearings in the trunk and I wanted a second opinion before I started the work.
I've got a 2003 Expy 4x4 with the 2H/AWD/4HI/4Lo tansfer case. It has 161,000 miles. Recently at highway speed (70mph) the left front wheel starting making an almost constant high pitched/metal to metal squeal. I was in AWD. I pulled off the road it made the noise at roughly the same pitch to 10 mph. The neither wheel was hot to touch. I got back on the road and it didn't do it for again for 45 minutes. The noise doesn't change if I hit the brakes or shift into AWD, 4HI, or 2H. There was a very slight change in pitch if a changed lanes. It would get better and worse for the rest of the trip and would usually get bit louder above 70.
I just got home and jacked up the front. Neither wheel has any back and forth motion if I grab and put force on the wheel from top to bottom and there is no noticable noise if I spin the wheel. The only noise from spinning the wheels is the gears in the auto hubs/CVs engaging for the first inch or two or spin (this sound seems normal). It appears as if the hubs are engaged in 2H with the engine running (is that the way its supposed to be?)
Anyway!? Is this the front unit bearing or something else? I have $600 worth of bearings in the trunk and I wanted a second opinion before I started the work.