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

Driveline vibration intermitten

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Old Jul 23, 2020 | 08:59 AM
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Default Driveline vibration intermitten

What would cause an intermittent vibration? First vibrations appeared intermittently about 1 second on and one second off at 90mph-130 very faint.

Doubt wheel balance is to blame. This pretty much happened over night.
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Old Jul 23, 2020 | 09:44 AM
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From: Jackstandican
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Weight on a wheel may have fallen off. Driveshaft could have bent. First step would be to check the tire balance. What you describe seems like vibration causing harmonics w/in the chassis. Is this a manual or auto? If manual, there's been those who've noted once the trans goes into a specific gear (usually a higher gear) there is a vibration. Is your DS stock? Stock steel DS's for these cars are notorious for being bent.
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Old Jul 23, 2020 | 12:28 PM
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Originally Posted by SS RRR
Weight on a wheel may have fallen off. Driveshaft could have bent. First step would be to check the tire balance. What you describe seems like vibration causing harmonics w/in the chassis. Is this a manual or auto? If manual, there's been those who've noted once the trans goes into a specific gear (usually a higher gear) there is a vibration. Is your DS stock? Stock steel DS's for these cars are notorious for being bent.
i should have been more specific. I’m running a t56 and have read that 5th & 6th fear issue but the vibration happens when I’m neutral and no matter the gear. Starts at 60 stops at 80 then comes back at 90. The DS topic has been beat to death but I would think if it’s a DS it wouldn’t happen intermittently.

Ill try try the basics. Few days ago took a trip to Tampa middle of the night kept up with a 911 gt2rs and 100-135mph was smooth as silk.
Now I’m afraid to go over 90mph
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Old Jul 23, 2020 | 04:08 PM
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From: Jackstandican
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Originally Posted by LTX
The DS topic has been beat to death but I would think if it’s a DS it wouldn’t happen intermittently.
Newp. Vibration, which you may not feel, cause harmonics which then carry more intense vibration throughout the chassis. There was a recall at least in '96 for steal driveshafts. The solution was for the dealer to install a 1LE aluminum. Mine vibrated from 70 to 80mph. Had to fight for an hour to have them honor their own ******* recall.
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