first high speed run

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Old Sep 7, 2009 | 08:49 PM
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Default first high speed run

I have only been driving around in this car for two months and i finally get a chance to open her up last night. performance was good for a bolt on auto ls1. However i think i discovered some problems.

The car had a lot of vibration at top of third and 4 (did not go WOT into 4th because it wouldnt shift) So it was around 120 130.

Pavlock told me i need to get an alumium drive shaft. What else should i look into to find the source of the vibration(s).

any input will help thanks..

mods are lid kooks borla 3.73. stock internal stock 4l60 and stock converter
Zr1's with Nittos on back
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Old Sep 7, 2009 | 09:03 PM
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u-joints maybe !?!?

wouldn't the driveshaft shake/vibrate if the u-joints were bad !?!?
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Old Sep 7, 2009 | 09:15 PM
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maybe balance the wheels?
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Old Sep 7, 2009 | 09:41 PM
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my car starts to vibrate at high rpms in od but it doesnt shift into od untill 145 lol
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Old Sep 7, 2009 | 09:57 PM
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get the tires balanced first... I dont think the 6-speed driveshafts were any different and I went 140+ quite a few times in my old car without any vibrations... it just got pretty loud. haha
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Old Sep 7, 2009 | 10:59 PM
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ok. I guess it may be important to note that there were more vibrations while decreasing speed - as in foot off the gas and coasting. When i pushed the gas there were still vibrations but much less.
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Old Sep 8, 2009 | 12:05 AM
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I would guess balancing the wheels too. My car does that as well when I let go of the gas on like 60 - 80.
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