LT1-LT4 Modifications 1993-97 Gen II Small Block V8

vibration at higher speed

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Old Apr 30, 2015 | 06:25 PM
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Default vibration at higher speed

Hey everyone I'm having a bad vibration at 75mph. Tires are all balanced good, u joints are good. If I put the clutch in and put it in neutral the vibration stops and everything is smooth. Doesn't seem to matter which gear. Could this be the result of a bad tailshaft bushing or something worse?
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Old Apr 30, 2015 | 07:27 PM
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Any aftermarket suspension? Stock gears? Stock driveshaft?
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Old Apr 30, 2015 | 07:48 PM
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Stock everything except rims.
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Old Apr 30, 2015 | 07:57 PM
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drive shaft.
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Old Apr 30, 2015 | 08:13 PM
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Wouldn't it vibrate even if it was in neutral if it was the driveshaft?
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Old Apr 30, 2015 | 11:53 PM
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Ahh yes I read your post wrong. I thought you said it still vibrates even with it in neutral.
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Old May 1, 2015 | 05:47 AM
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Does it vibrate with the clutch engaged in nuetral?
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Old May 1, 2015 | 06:07 AM
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Originally Posted by kinglt-1
drive shaft.
X2, get it balanced and new joints
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Old May 1, 2015 | 06:41 AM
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Originally Posted by hrcslam
Does it vibrate with the clutch engaged in nuetral?
It doesn't do it nearly as bad. In neutral without the clutch engaged its smooth.
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Old May 1, 2015 | 07:29 AM
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Smooth with no load on driveline usually points to backlash adjustment on the gears is not right.
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Old May 1, 2015 | 07:36 AM
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I had a clunk when I would shift into 3rd, sometimes a shutter, and a vibration in 4th (od, I'm a A4 ) on the highway. Checked my u joints they seemed fine, after a few trips to the track it got worse so I yanked the driveshaft out and had it balanced and new joints pressed in anyways. Every issue is gone, I think the driveshaft is something to look into
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Old May 1, 2015 | 11:06 AM
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i have the same issue, vibrates at highway speeds in 6th gear. i have an ls1 alumunum ds in my car that i got used, luckily i kept the stock steel one and am going to swap it back out and see if it goes away.
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Old May 1, 2015 | 04:43 PM
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Originally Posted by hokeplaya05
i have the same issue, vibrates at highway speeds in 6th gear. i have an ls1 alumunum ds in my car that i got used, luckily i kept the stock steel one and am going to swap it back out and see if it goes away.
How much would you want for the aluminum one if you wanted to sell it?
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Old May 1, 2015 | 08:12 PM
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Originally Posted by SS RRR
Smooth with no load on driveline usually points to backlash adjustment on the gears is not right.
How do you adjust the backlash?
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Old May 1, 2015 | 08:47 PM
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Originally Posted by lt941
How much would you want for the aluminum one if you wanted to sell it?
not looking to sell it, sorry. just using it to see if the vibration goes away, then i know if i need to balance the aluminum one or get new u-joints. i know the steel one is good, so just using it to help diagnose the issue
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Old May 2, 2015 | 04:38 PM
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When I turn sharp and am just idling in 1st i can feel and hear a clunking sound through the shifter. I'm not sure if that would be related or part of the problem.
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Old May 2, 2015 | 05:15 PM
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Originally Posted by lt941
When I turn sharp and am just idling in 1st i can feel and hear a clunking sound through the shifter. I'm not sure if that would be related or part of the problem.
Is it like a snapping and goes away when you get straight?
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Old May 2, 2015 | 05:19 PM
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Originally Posted by 98CayenneT/A
Is it like a snapping and goes away when you get straight?
Its more of clunk. Yes goes away when straight
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Old May 2, 2015 | 05:30 PM
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Originally Posted by lt941
Its more of clunk. Yes goes away when straight
Just a guess but it may be your rear end. Auburn diff.?
I would get the back end up, pull the cover off and check the spider gears and ring and pinion. If all looks good fill it back up and add two bottles of limited slip additive
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Old May 2, 2015 | 05:50 PM
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Originally Posted by 98CayenneT/A
Just a guess but it may be your rear end. Auburn diff.?
I would get the back end up, pull the cover off and check the spider gears and ring and pinion. If all looks good fill it back up and add two bottles of limited slip additive
Could that also be what's causing the vibration?
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