LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

at wot car vabrates bad

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Old Mar 3, 2007 | 09:51 PM
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From: st louis, mo.
at wot car vabrates bad

so when i am at wot in 2nd gear around 5500 rpm the car starts to shake and vibrate really bad not sure if this a susp. issue or drivetran, looking for help as to what it maybe or if anyone esle is having the same problem.

thanks
james
Old Mar 3, 2007 | 10:20 PM
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Perform some tests to isolate the problem. Does the vibration occur while parked and reving the motor? Does the vibration occur at 60 mph and the tranny in neutral (coasting)?
Old Mar 3, 2007 | 10:22 PM
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this may help...

http://www.babcox.com/editorial/us/us50126.htm
Old Mar 3, 2007 | 10:35 PM
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Originally Posted by ZL1modified

i was thinking driveshaft because it onlys happens at wot and in the higher rpms, but i will be reading though this and trying out everything.
Old Mar 3, 2007 | 10:53 PM
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Originally Posted by z95lt1
i was thinking driveshaft because it onlys happens at wot and in the higher rpms, but i will be reading though this and trying out everything.
i have to do this tomorrow... i have a very similar vibration as you... the more into the throttle i am the harder it shakes... does it from like 55-65 and then again at like 80-85...
Old Mar 3, 2007 | 10:53 PM
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Originally Posted by z95lt1
i was thinking driveshaft because it onlys happens at wot and in the higher rpms, but i will be reading though this and trying out everything.
Driveshaft vibration is a function of speed, not rpm. If your driveshaft is the culprit, you feel it at while doing 70 mph on the freeway and the engine in neutral (rpms at 650).
Old Mar 4, 2007 | 07:16 AM
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Originally Posted by OBE1 95Z28
Driveshaft vibration is a function of speed, not rpm. If your driveshaft is the culprit, you feel it at while doing 70 mph on the freeway and the engine in neutral (rpms at 650).
it only seems to be when i at wot in the higher rpms not when crusing at all.
Old Mar 4, 2007 | 02:30 PM
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Originally Posted by ZL1modified
Originally Posted by z95lt1
i was thinking driveshaft because it onlys happens at wot and in the higher rpms, but i will be reading though this and trying out everything.
well, i did the troubleshooting today... looks like i need a new drive shaft...
it let up a little when i took the rotors off also... probably wouldn't hurt to get new ones...

did you find anything out yet?
Old Mar 4, 2007 | 04:02 PM
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vibrates*
Old Mar 4, 2007 | 04:53 PM
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jimmy its your LCA's, take them off and give them to me.
Old Mar 4, 2007 | 05:01 PM
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Originally Posted by z95lt1
so when i am at wot in 2nd gear around 5500 rpm the car starts to shake and vibrate really bad not sure if this a susp. issue or drivetran, looking for help as to what it maybe or if anyone esle is having the same problem.

thanks
james
did u by chance just put in a poly tranny mount??? did it happend after that?

or did it just strart doing this
Old Mar 4, 2007 | 09:24 PM
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Originally Posted by CamaroSS30thAnn
did u by chance just put in a poly tranny mount??? did it happend after that?

or did it just strart doing this
i did replace the tranny mount but not with a poly mount just the stock rubber kind.
Old Mar 4, 2007 | 09:25 PM
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Originally Posted by Ironxcross
vibrates*

sorry not an englich teacher.lol
Old Mar 4, 2007 | 09:28 PM
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Originally Posted by ZL1modified
well, i did the troubleshooting today... looks like i need a new drive shaft...
it let up a little when i took the rotors off also... probably wouldn't hurt to get new ones...

did you find anything out yet?

have not had a chance to mess with it yet. i am taking my alum. ds to the shop tomorrow and i am just going to put that in and see what happens.
Old Mar 4, 2007 | 11:43 PM
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try unbolting it at the rearend and spinning the drive shaft 180 degs it mostly fixed the vibration i was getting around 70
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