5ktq massive vibration from rear 20-40mph (solved)

[L DC]

Kurt,

By drive-shaft you mean the 1/2 rear drive-shafts, and
not the main one running from the tranny to the rear
diff., correct?

Reason I ask is that on the main drive shaft, I have
seen weights on, but never on 1/2 driveshafts.

-Regards,

-Louis 

 

--- Kurt Deschler <desch at alum.wpi.edu> wrote:

> 
> The vibration was due to the driveshaft balance
> weights rusting off and 
> presumably further imbalance from flake rust. I
> found a good used 
> replacement and the problem is gone. People in the
> rust belt need to be 
> aware of this issue. The parking brake cables are
> easy to get to with the 
> drive shaft out and can be easily changed at the
> same time.
> 
>  	-Kurt
> 
> On Mon, 2 Oct 2006, Kurt Deschler wrote:
> 
> >
> >
> > I am trying to isolate the source of massive
> vibration from the rear of my 
> > 5ktq. The problem is definitely dependant of wheel
> speed, not engine speed 
> > and comes on hard and fast at 20mph. Problem also
> occurs with the rear end up 
> > on jacks. I tried adjusting the prop shaft bearing
> and geasing the U-Joint 
> > and neither helped. I have also ruled out the
> brakes. Could the rear diff be 
> > bad? It used to weep fluid so it is possible it
> went dry. The vibration 
> > reasonates the entire back of the car and is
> enough to rattle your teeth out.
> >
> > 	-Kurt
> >
> >
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