Intermittent Drive Train Vibration

[Fishpie]

Hi All,
I have a Z 66 problem that I would like to get advise on before going to the dealer with.
It is an intermittent vibration very similar to a badly out of balance wheel or driving on a road that a tracked vehicle has just made dents in. The vibration is continuous but becomes faster and more pronounced as I go faster and lasts until I make a full stop.
It has happened about 6 times in the last 1000 miles and generally occurs when I'm cruising on the Interstate. In fact when it first happened I thought I had a flat, the vibrations were easily felt through the steering wheel and even the brake pedal as I pulled to a stop. Once I come to a complete stop and drive away the vibrations are gone.
My thoughts are that it is either an ABS or prop shaft balance problem. I have checked the wheel nuts and dismissed an out of balance wheel since the problem is so intermittent.
Any advise would be appreciated as I know it will be difficult to reproduce the vibration for the service manager.
Jonny

 

[shafman1]

I believe Butch had a problem with his and it ended up being the front differential. You may want to do a search or IM Butch.

 

[corvette95]

I am having the EXACT SAME PROBLEM on my 2002 2wd AV. Mine only has 1300 miles on it. Has been to the dealer 5 times..they rebalanced tires then after 3 tries I had Firestone replace the tires..same vibration between 68-75 mph. Anyone else with this problem please email me at corvette95@excite.com

 

[chazmo2]

Fishpie & corvette95 I had the same problem with my av.
Intermittent vibration above 65mph.
My solution was the dealership dropped the driveshaft and rotated it 180 degrees. Presto! the vibration was gone.
Also consider you might need a wheel alignment. I read a post that many av's during transport get knock out of alignment
I hope ths helps you guys out. Let me know if this works since there aren't any TSB's from GM on this subject.

 

[cpuchniak]

I have the same problem in a 2500 Av--couldn,t figure what it could be--not tire bal as not always there,though it goes away at 120k/hr,and is smooth above and below that speed.It's fine vib that almost feels as if the engine was starving for gas.,hesitating.there is no vibs in the steering at all;

Think the driveshaft fix is where it's all at--great tip guys!!