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

vibration?

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Old 08-13-2007, 10:03 AM
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Default vibration?

ok wasn't for sure where to put this, but when i'm driving 70mph and up, and let off the gas to coast...i have a horrible vibration, and once it drops below seventy it stops. but also messing around...i found out that its only in sixth gear. if i take 5th to 80 or 85 and let off and coast..no vibration.

and it doesn't really start vibrating on acceleration until about close to 90 (6th). has anyone had something similar to this? didnt used to dot his but prolly two month ago it started
Old 08-13-2007, 10:15 AM
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i had a 98 s10 that started off doing that at high speed then eventually secound gear and up. it was bad u-joints i DOUBT that is the same problem that you have. but i thought id throw it out there
Old 08-13-2007, 11:36 AM
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yeah i was thinking the same thing...but they are relatively new..prolly about 5k miles on them..i'll check them out. thanks
mike
Old 08-13-2007, 04:05 PM
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Could be an unbalanced driveshaft. That's one of the more common causes of speed dependent vibrations with the steel ds on lt1s.
Old 08-13-2007, 08:40 PM
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Ya mine started doing something like that over the weekend but mine is a auto... around 75 or 80 on the highway it gets a strong vib....almost a grawl but as soon as I slow it down under 75 it goes away....
Old 08-13-2007, 08:52 PM
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Originally Posted by infinitebird
Could be an unbalanced driveshaft. That's one of the more common causes of speed dependent vibrations with the steel ds on lt1s.
good point, however it is unlikley that a drivshaft can go out of balance unless the rare chance of a wieght flying off. also, like he said, it is not all based on the speed he is at, it also has to do with gear and acceleration or deceleration. ide say u joints. maybe faulty installation or bad set of joints
Old 08-14-2007, 12:06 AM
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Originally Posted by LT1Falcon
good point, however it is unlikley that a drivshaft can go out of balance unless the rare chance of a wieght flying off. also, like he said, it is not all based on the speed he is at, it also has to do with gear and acceleration or deceleration. ide say u joints. maybe faulty installation or bad set of joints
You might be right considering the gear/acceleration variables, however the driveshaft issue is a very common problem. There was a TSB on it for several model years.
Old 08-15-2007, 02:20 PM
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hey guys, thanks for the responses, much appreciated
Old 08-15-2007, 10:58 PM
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Default Three things...

Balance the DS first, then while you've got the thing off the car get solid Spicers installed, Oh, and check your trans mount too - That was my problem. That 1-2 shift with a Kevlar clutch is brutal!

Originally Posted by infinitebird
You might be right considering the gear/acceleration variables, however the driveshaft issue is a very common problem. There was a TSB on it for several model years.



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