C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Wierd vibration issue under load in gear.

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Old Aug 24, 2003 | 08:45 PM
  #1  
MrNuke's Avatar
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From: Shelton CT
Default Wierd vibration issue under load in gear.

Ok I have no idea what this could be. Taking ideas. :cheers:

On the highway after 2300rpms, when I put a load on the engine (1/2 way on the gas or so) I start getting a vibration or resonance or something from what it feels like the middle of the car underneath, driveshaft or something.
It just started getting noticeable the past week or so.

Does the same in 2nd at 3K and 3rd at 3K rpms.
It is not suspension related I think, as when coasting at any speed it never does it.

I recently had put in a Dana44 in the car, all new spicer u-joints that looked very good. Manual driveshaft also with new u-joints.

Could somethign be getting lose or something?


:confused:
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Old Aug 24, 2003 | 09:40 PM
  #2  
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From: High Plains Drifter Fayetteville, AR
Default Re: Wierd vibration issue under load in gear. (MrNuke)

TQ converter? Just guessing. Does the vibe go away over 3Krpms?
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Old Aug 24, 2003 | 09:52 PM
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From: Shelton CT
Default Re: Wierd vibration issue under load in gear. (JCAIRE2)

It seems to go away after 4K.

I too thought about the tc, so I put on my tc lockup delay harness. This only lets the tc lockup in 4th at like 80-90mph or something like that.

Makes no difference at all..
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Old Aug 25, 2003 | 07:48 PM
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From: Nashville Tennessee
Default Re: Wierd vibration issue under load in gear. (MrNuke)

maybe loose t. converter bolt, I had a crack in a harnonic balancer on my SS, felt like you described till it let go. :eek: then all hell broke loose.
Check U-joints, flywheel, anything that rotiates.
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Old Aug 25, 2003 | 07:55 PM
  #5  
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From: Shelton CT
Default Re: Wierd vibration issue under load in gear. (jimmyd)

Is there a way to tell if a harmonic balancer is on its' way out?
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Old Aug 25, 2003 | 08:01 PM
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From: Waipahu Hawaii
Default Re: Wierd vibration issue under load in gear. (MrNuke)

Is there a way to tell if a harmonic balancer is on its' way out?
Heah man, this might sound stupid but do you think that maybe your drive shaft is out of balance?
I too had a bolt missing one time flex plate and it caused a woobleing vibration on the car at curtain speeds.
Just a thought, probably usless info from me.


[Modified by Hawaiian Punch, 3:02 PM 8/25/2003]
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