[Northkeep] Question for the mechanically inclined.

ld.blackmoon ld.blackmoon at cox.net
Tue Aug 11 12:09:30 PDT 2009


kevin just from the description , it sounds like a rear u joint going out ., 
do you know how to check it ??

Be Safe , Be Happy, Have Fun
----- Original Message ----- 
From: <kevinkeary at aol.com>
To: <northkeep at lists.ansteorra.org>
Sent: Tuesday, August 11, 2009 12:50 PM
Subject: [Northkeep] Question for the mechanically inclined.

>I (and the finance company) own a late-model Chevy Trailblazer, which
> is sort of like a preppy Jeep. It has settings for two wheel drive and
> others I've maybe used once for automatic four-wheel, four-wheel, and
> low-range four-wheel drive. This morning it developed a vibrating
> noise, with symptoms I've never encountered before.
> The noise comes up through the floor in the back, where the tank (and
> presumably the fuel pump) and the exhaust system (the muffler but the
> catalytic converter should be farther forward, unless acoustics are
> doing something funny) and the rear differential are. But it only
> happens at fairly high speeds, over twenty miles per hour maybe, and
> only when there is no pressure on the accellerator.
> It doesn't happen when the cruise control is on, presumably because it
> always keeps some positive pressure on the drive system. It doesn't
> shake the car or affect its handling or power. The lightest feather
> touch on the accelerator stops it, but it starts again 1 to three
> seconds after I let off the gas completely.
> I would think if it were a blocked catalytic converter, it would be
> worse when accelerating, and the same if it were the fuel pump. It
> doesn't seem to fit a wheel bearing or a brake problem either. I
> worried about a U-joint on the driveshaft, but I found very little play
> in the system when I shifted from reverse to drive and back (while
> holding the brake with the truck motionless), and no noticeable 'clunk'
> sound.
> Any ideas? Keigan is driving the vehicle, so if it IS a U-joint going
> out, I want to know that and get it fixed.
> Kevin
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