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Vibration at 100 mph

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Old Jun 6, 2006 | 10:03 PM
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Default Vibration at 100 mph
I had my gears swapped the other week and noticed that my car vibrates at about 100 or so. This started right after the gear swap so I am sure that it is because of this. I am about to take it back to the shop, is there anything in particular that may cause this?
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Old Jun 7, 2006 | 03:35 AM
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If you put in lower gears it may be because your driveshaft is spinning faster than before.
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Old Jun 7, 2006 | 06:35 AM
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I did put in 3.73s, which are up from the 3.23s stock. I wonder though how come it is doing that now? Before hand, I've taken it up to 130ish and it never vibrated at all. I also don't have the stock steel LT1 driveshaft but the aluminum LS1 driveshaft.
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Old Jun 7, 2006 | 12:45 PM
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Originally Posted by AceHaag
If you put in lower gears it may be because your driveshaft is spinning faster than before.
So is there anyway to fix this problem? I am currently having the same problem at around 80+ mph. I think I still have the stock LT1 driveshaft though if that makes a difference.

Mike
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Old Jun 7, 2006 | 01:10 PM
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Originally Posted by 96_TA
So is there anyway to fix this problem? I am currently having the same problem at around 80+ mph. I think I still have the stock LT1 driveshaft though if that makes a difference.

Mike
You know, I think I may have read somewhere that if you disconnect the U-Joints and rotate the driveshaft 180*, then it puts it back to how it may have been before the gears were installed. I'm going to try that and let you know if it works.
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Old Jun 7, 2006 | 01:45 PM
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Cool, good luck and please let me know how it goes.

Mike
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Old Jun 7, 2006 | 10:42 PM
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Originally Posted by 96_TA
So is there anyway to fix this problem? I am currently having the same problem at around 80+ mph. I think I still have the stock LT1 driveshaft though if that makes a difference.

Mike
In my experience with this issue, the vibration will be better with the Al shaft. Try it and see.
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Old Jun 8, 2006 | 03:46 AM
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Originally Posted by RedRyder518
I did put in 3.73s, which are up from the 3.23s stock. I wonder though how come it is doing that now? Before hand, I've taken it up to 130ish and it never vibrated at all. I also don't have the stock steel LT1 driveshaft but the aluminum LS1 driveshaft.
Did you change the drive shaft at the same time?

Did you check the u-joints for play?

Did you tires throw the wheel weights?

Lots of possibilities espescialy at those kinds of speeds.
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Old Jun 8, 2006 | 10:21 AM
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Originally Posted by CW00BlackTA
In my experience with this issue, the vibration will be better with the Al shaft. Try it and see.
What is an Al shaft?

Mike
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Old Jun 8, 2006 | 10:32 AM
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Originally Posted by 96_TA
What is an Al shaft?
aluminum.
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Old Jun 8, 2006 | 02:36 PM
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Originally Posted by AceHaag
aluminum.
lol ohhh ok

Thank you.

Mike
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Old Jun 8, 2006 | 02:39 PM
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they already said it, but yea, its probably from the driveshaft spinning faster.
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Old Jun 11, 2006 | 09:59 PM
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GOOD NEWS: I unbolted the U-Joints at the rear end and rotated the rear 180 degrees and put the driveshaft back in. Absolutely NO more vibration, so go on and try that out.
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Old Jun 12, 2006 | 01:43 PM
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Sweeeeet. So you rotated the driveshaft 180 degreees? Counterclockwise or clockwise?

Thanks a lot

Mike
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Old Jun 12, 2006 | 01:46 PM
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Doesn't really matter. Like I said, I just unblolted the U-Joints from the rear and slid it out, turned the wheels until the yoke (I think that is what it is called?) was turned 180 degrees, and then put the U-Joints back in. Hope it helps you out!
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Old Jun 12, 2006 | 04:06 PM
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Sweet, thanks a lot man

Mike
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Old Jun 14, 2006 | 11:32 AM
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Just got off the phone with the mechanic...he says the U-joint is all rusted to ****. Hopefully thats what the prob was.

Mike
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Old Jun 16, 2006 | 01:00 AM
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maybe if you drove the speed limit.... haha just kidding i dont know if anyone on this forum always does
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Old Jun 16, 2006 | 01:54 PM
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Originally Posted by 1sick'98WS6
maybe if you drove the speed limit.... haha just kidding i dont know if anyone on this forum always does
Of course I always drive the speed limit....................................haha

Mike
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