Shaking in the rain

[Bernie Benz]

Sounds like propeller shaft cavitation to me.

Bernie

> From: Dave C <dconner at gmail.com>
> 
> I just returned from a trip to Florida and Georgia in the 87 5ktq
> where the monsoon season was in full swing.  A problem developed
> during hi-speed driving on roads with accumulated water ... the car
> would develop a violent shudder like an out of balance washing
> machine.  It seemed to be coming from under the middle of the car.
> Taking my foot off the accelerator or shifting in to neutral made no
> difference.  Slowing down would cause the shuddering to slow down.
> I'd coast to a stop, wait briefly, then go on and all would be normal
> until I'd pass through more water and this would bring it on again.
> Brief water wouldn't do it .... many minutes of high speed water would
> bring it on.  Wet roads, spray, and normal rain were no problem,
> torrential downpours with inch deep water on the road would bring it
> on.
> 
> It kind of felt like the center drive shaft was out of balance or
> alignment.  I looked at the driveshaft, carrier bearing, etc and all
> appear normal.  I greased the U-joint within the past month.  There
> are 140k miles on the car and as far as I know there has never
> been any work done on the driveshaft.
> 
> Any ideas?
> - -
> Dave C.
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