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vibration... help please!!!

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Old Dec 29, 2011 | 05:50 PM
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Default vibration... help please!!!

i got a 2000 z28 a couple weeks ago. it had a vibration when u let off gas at highway speeds. i thought it be a easy fix. but i was wrong. i have checked everything i think think of. i have reset preload on pinion. i then thought maybe it was the gears i changed them. i tried changing drive shaft that didnt help. it had ploy trans mount i went back to stock. that mad it better but i still kind feel it. now i can feel vibration a second and goes away when u let off gas. i noticed today if put in neutral it does it really bad.
any help is needed please

let me note it has a 7.5 rear and nothing aftermarket but gear and pinhard bar.
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Old Jan 1, 2012 | 09:46 AM
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a4 or m6? to make sure I understand you correctly...you have a vibration at highway speeds, only when you left off the gas and when you put it in neutral, it gets worse, correct? Where do you feel it, in the steering wheel, pedals, floorboard, or seat? Not sure I can help, just trying to narrow down where it might be coming from. I've had a few vibration problems in some of my f-bodies.
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Old Jan 1, 2012 | 10:31 AM
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Originally Posted by badazz99ta
a4 or m6? to make sure I understand you correctly...you have a vibration at highway speeds, only when you left off the gas and when you put it in neutral, it gets worse, correct? Where do you feel it, in the steering wheel, pedals, floorboard, or seat? Not sure I can help, just trying to narrow down where it might be coming from. I've had a few vibration problems in some of my f-bodies.
a4. yes at highway speed. yes when let off and worse in neutral. comes from rear. floorboard.. i let my dad ride with me he said im being to picky
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Old Jan 1, 2012 | 10:37 AM
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basic question, i know, but are your tires balanced, any bent rims? did you notice any difference when you put the new driveshaft in? did you make sure it was balanced?
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Old Jan 1, 2012 | 10:42 AM
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try putting the car on jack stands and spinning the rear wheels to check for a bent axle.
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Old Jan 1, 2012 | 11:03 AM
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Could be the motor mounts... do you have stock polys or solids? If you have stock ones, you could have ones that are shot...
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Old Jan 1, 2012 | 11:44 PM
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Before you go completely nuts about this, make sure your tires are balanced. I had almost the exact same problem. I took the tires to the shop and the driver's side rear was 4oz's out!! That my friend, will give you a vibration that makes you think the u joints are going to depart and lodge themselves in your backrest.
Check the simple stuff first, hopefully you'll have the same problem.
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