Persistent vibration, 87 5KQT

[Grant Lenahan]

Propshaft?

Tires?

Grant
On Oct 30, 2010, at 9:41 PM, John Larson wrote:

> I'm about at the end of my rope.  I have a customer's well worn, high 
> mileage, 5KTQ here that has developed a low pitched humming vibration at 
> freeway speeds, although the noise persists as low as 30MPH, maybe even 
> lower.  I've checked the axle shafts for bends, replaced a bent RR 
> wheel, and aligned the driveshaft with a cool home made fixture.  I 
> spoke with a chassis and alignment guy this afternoon (he's gonna drive 
> it Monday) and he asked about the wheel bearings.  I've done probably 
> 500 double row wheel bearings in my career, and I've never had one sound 
> like this.  They mostly howl or make a low frequency rumble, and usually 
> (but not always) change tone or volume when side loaded by turning the 
> car one direction or the other.  This noise comes on as you build speed 
> on the freeway, and is there whether you're going straight or turning.  
> The volume, tone, and frequency appear to remain pretty constant.  As 
> always, any and all constructive input would be sincerely appreciated!
> 
> TIA!  John
> _______________________________________________
> quattro mailing list
> http://www.audifans.com/mailman/listinfo/quattro
> http://www.audifans.com/kb/List_information
> 

Grant Lenahan
glenahan at vfemail.net