If the vibration is fairly gross then it might be a real time saver if you can rent, borrow, beg, or steal one of these:

J-38792-A Kent Moore EVA tool rental, electronic vibration analyzer, EVA, EVA2, Rotunda, SPX, OTC, Ford, GM, Toyota, Honda

I've been battling a vibration problem for some time and the "EVA" was very useful....to a point. It vastly narrowed down the possbilities and I was able to mostly fix the problem.

However, if the vibration is high frequency/low amplitude the EVA cannot (in my experience) give useful results. So, for example, if the vibration is no more then a "tingle" sensation thru the seat or steering wheel (such as my car) the tool probably won't be of any help.

It might be worth taking the car to a shop or dealer who has "EVA" and paying them for a couple hours labor to test the car using EVA and see what results come up.

I am lucky enough to be a good terms with a local Chevy dealer. I can borrow the equipment over the weekends.

Cheers
DD

 

The car was up in the air on a hydraulic lift.

We pulled out the axial and was able to return it. The old one is back in... Prior to this we replaced the back right axial, no change..this time we switched axial's and there was a vibration change from the back right to back left... The back right tire was no longer bouncing up and down. Now the back left was moving up and down but less than what the back right was. Thought that we had a bad replacement axial and replaced it again.

Does anyone know if you can balance those small axials? The shops that I have called around ATL can't do it.

 

I tried this when the problem started and it did not change the vibration for me.. What was interesting was that after I replaced my entire driveshaft the vibration changed, it became much more noticeable. The center support was shot, so I guess things are a little tighter... So frustrating... I don't want to start throwing parts at this thing.

 

Try examining the mounting flanges and shim on the suspect halfshaft. Halfshaft is the American term for the part, whereas in the UK the name is driveshaft, and the American driveshaft is a propellor shaft.

Also inspect the universal joints on the halfshaft.

 

I am having the exact same problems with my car. I have gone through all the remedys that Casey did I even changed the rear end as an assembly from my doner car then the differential. New wheel bearings, half shaft u joints,new driveline with balance ,u joint and carrier. The car maves a low rumble mixed with vibration above 50 mph clear to 100 mph. I can then shift into neutral , let the engine idle with no change to the rumble vibration. coasting down it goes away at 50 mph every time. I even did new motor mounts last week to no avail. Im suspecting the Transmission at this point. Does anyone have experience or a solution with this enormous frustration?

 

I reread the thread and recognized you had already done what my post was suggesting so I am
revising it. If the vibration is occurring in 3rd gear but not in fourth, (at the sounding speed) that
means that everything aft of the tranny is not causing the issue and points to the tranny as the
vibration originator.

 

I have a low frequency hum in my low mileage ‘03 VDP at the 50-60 speeds. It disappears if I come off the throttle or drop into 4th. It’s been suggested to me here it is a torque converter issue. The noise may be there above and below those speeds but my hearing aids aren’t picking it up. No discernible vibration.

Sometime in the next few months I’m taking it to a driveline shop for their opinion. I know of one other VDP driver who has reported a similar hum and chalked it up to a harmonic vibration. If I get a diagnosis that is more than “well, it could be the xxxxx” I will follow up here. One shop suggested I drive it until there’s a problem and then bring it in. No thanks.

 

Yeah...I have always had a problem with the "drive it till
it breaks" merthod.