intermittent driveline vibration in '96 K1500 Suburban

Recently, I've noticed what feels and sounds like driving over finely
grooved pavement. It's intermittent, and for a couple of weeks, I thought
it was simply small perpendicular pavement grooves like one occasionally
sees on major highways.
Turns out, it's not. When it starts, I can stop it by letting off the
throttle, and it's more evident when towing and/or in "overdrive" mode.
I recently had the rear axle seals and brakes replaced by a GM dealer, and
I don't remember this happening before that.
Any ideas what this might be??
Thanks
Guy

I'd look at the driveshaft u joints. Also did the dealer take the shaft
during this repair? If so(shouldn't need to), may not be indexed properly,
possibly they left a rear wheel loose?
"RM23J8G" <rm23j8g RemoveThis @aol.com> wrote in message
news:d899269b007cd16799c955cf73c1dd27@localhost.talkaboutautos.com...
 > Recently, I've noticed what feels and sounds like driving over finely
 > grooved pavement. It's intermittent, and for a couple of weeks, I thought
 > it was simply small perpendicular pavement grooves like one occasionally
 > sees on major highways.
 > Turns out, it's not. When it starts, I can stop it by letting off the
 > throttle, and it's more evident when towing and/or in "overdrive" mode.
 > I recently had the rear axle seals and brakes replaced by a GM dealer, and
 > I don't remember this happening before that.
 > Any ideas what this might be??
 > Thanks
 > Guy
 >



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