Rear Wheel Wobble (with video)...Please Help Diagnose! - Chicagoland Sportbikes
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post #1 of 16 (permalink) Old 09-04-2011, 02:26 PM Thread Starter

 
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Rear Wheel Wobble (with video)...Please Help Diagnose!

So I'm finally getting around to tackling my rear wheel noise.

As the car moves forward or reverse, there's a wobble / "whomp whomp whomp" sound. The sound/wobble feeling (I think I can feel it in my butt, clearly to the back right)...gets lounder and quicker as the speed of the car increases.

Holding at 3 and 9 there's no play in the wheel, and same at 12 and 6.

After reading through a ton of threads here and not really getting anywhere on my own...I decided to lift her up and see what's going on.

Put on stands, removed the wheels, car in drive...this is what happens. The left side seems fine, but the right side moves in and out. I move the camera around a little in the video and from different angles you can see the in and out motion. This has got to clearly be the problem.

(Update: I've jacked the trailing arm to see if there was stress being put on the ujoints causing the wobble, but jacked or unjacked the right side has this wobble, and the left side spins nicely.)

Can anyone help diagnose what might be causing this? Any help is much appreciated!!

http://www.youtube.com/watch?v=AT8ZbMQzJGg


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post #2 of 16 (permalink) Old 09-04-2011, 02:47 PM
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I take it this is your vette. I think it is toast, I'll give you $50 for it.

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post #3 of 16 (permalink) Old 09-04-2011, 03:17 PM
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I can't see the video w/ my dinky blackberry. But from the wobbling on the wheel and the, "womp, womp, womp" sounds, I would say it's the gear hub bearings. I never work on a trailer before, but worked on many cars & trucks.

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post #4 of 16 (permalink) Old 09-04-2011, 03:31 PM
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Quote:
Originally Posted by envious369 View Post
I can't see the video w/ my dinky blackberry. But from the wobbling on the wheel and the, "womp, womp, womp" sounds, I would say it's the gear hub bearings. I never work on a trailer before, but worked on many cars & trucks.
I'm no professional by any stretch but that would be my guess too.

The video makes it hard to tell whether the noise is coming from the engine or the problem.

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post #5 of 16 (permalink) Old 09-04-2011, 04:00 PM Thread Starter

 
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Thanks folks.

The video sound is actually from the engine only, well engine and exhaust. The exhaust is side pipes that come out right in front of the rear wheels obviously, so that's that in the video.

The womp womp is only heard while driving...not while it's up on stands.

My thinking is bearing like you guys said or u-joints. Was hoping someone can see this, recognize it, and say definitively what the problem probably is.

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post #6 of 16 (permalink) Old 09-04-2011, 05:06 PM
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unjoint binding /worn

do they have grease zerks?

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post #7 of 16 (permalink) Old 09-04-2011, 05:19 PM
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+2 to the wheel bearing, but usually a bearing that bad you could feel by rocking the wheel back and forth while jacked up. Also does it do this while only making a turn a certain way, driving straight or all the time?

Also check to see if the half shaft is bent. Could be the in the differential like a c-clip broke or the bearing where the axle comes out is bad.

I'm not crazy, my mother had me tested.
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post #8 of 16 (permalink) Old 09-04-2011, 09:13 PM
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you might also want to pull the rotor first and see if there's a high spot on the hub flange, or the inside of the rotor where they mate, because that will also cause the wobble.

also, is that rotor lugnutted on? if it isnt, id try doing that and look at it again.

I think its a bound ujoint. either way, i'd pull the spindle and see how that ujoint moves around, and you can check the hub bearing at the same time..
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post #9 of 16 (permalink) Old 09-05-2011, 11:30 AM
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Looks like the shaft / bearing assembly is the culprit. That clearly should run true.

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post #10 of 16 (permalink) Old 09-05-2011, 09:24 PM
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Replace the u-joints and start from there.

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post #11 of 16 (permalink) Old 09-06-2011, 11:09 PM
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Quote:
Originally Posted by JRSMAIL View Post
Replace the u-joints and start from there.
this, wheel bearings won't cause a wobble unless they are completely toast and have play in them. U-joints will bind in place and cause all sorts of vibration.

J
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post #12 of 16 (permalink) Old 10-05-2011, 02:17 AM
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PP so what was the verdict?

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post #13 of 16 (permalink) Old 10-06-2011, 07:22 AM
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Vettes are well know for the rear wheel brgs going bad. This has been a known problem for many years

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post #14 of 16 (permalink) Old 10-08-2011, 11:01 AM Thread Starter

 
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No verdict so far.

The car is up on stands, removed the half shaft and checked the ujoints. No binding at all. They are smooth as butter and they look fine (they're only 2 or 3 years old). So, this leads me to believe it's got to be something within the hub or bearing or whatever. But again, all looks/feels good. No play at all.

The car has sat like this for the last 2 weeks as I hate working on things that have no clear sign of trouble/solution. I know that's lame. I think I'm going to reinstall the half shaft and see if that fixes anything. Maybe the ujoint was tight and binding and this will relieve it. Not sure.

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post #15 of 16 (permalink) Old 10-08-2011, 02:09 PM
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you have it apart, install new stuff, no reason to do it twice.




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post #16 of 16 (permalink) Old 10-08-2011, 03:00 PM

 
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couldn't tell much from the vid except your suspension is uncompressed which changes the shaft angle and any stress or binding on the u-joints...just a thought....good luck Pete

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