[Northkeep] auto advice?
Kevinkeary at aol.com
Kevinkeary at aol.com
Mon Oct 18 07:06:52 PDT 2010
Anybody out there know anything about small 4-wheel drive systems?
We own a Trailblazer,'04. We've already replaced the rear differential
because some previous owner or witless mechanic put the wrong lubricant in it.
We only use the front drive system when we're moving a heavy trailer around
our yard, off pavement.
It has acquired a roaring sound that Keigan describes as an airplane roar.
It is getting louder. It seems to be coming from the forward portion of the
vehicle this time, but it's hard to tell; it only shows up above 20mph,
gets loudest at 40-50mph and weakens above 65mph. (We drove to Houston and
back this weekend.) I suspect a u-joint on the forward driveshaft, but
crawling under it this morning, I can turn the forward shaft freely (4wd is not
engaged, but front wheels are on ramp and can't turn) and there is no play
in the u-joint on the front of the driveshaft. (There isn't one on the other
end, the end that fits into the forward transmission or whatever it's
called.) I can't detect any play in the front drive axles either.
Last Thursday I replaced the brake pads on both front disks. I didn't
detect any problems that felt like wheel bearings -- and I don't THINK that's
what this sounds like anyway.
Any ideas?
Kevin
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