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Topic: Drive train viberation

in Forum: C3 Driveline Components


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Drive train viberation (1/8)
 4/16/08 7:36am
zgator
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Savannah, GA - USA

Vette(s):
1982CE,32,000 and counting. (fast!!) 1981 Vette, black on black. ZZ4 (quick!!)


Joined: 1/20/2005
Posts: 936

I just got this 81 last sat. Having run it for a few days I see that I have a viberation. Around 35,3700 RPM it starts. It's a drone that comes and goes every 1/4 sec so it's pretty constent. The info I have on the car is that it's got a 350 HO GM crate engine turbo 400 with a "mean shift kit. Trans has been rebuilt. A 1,200 stall. The driveshaft has been "rebuilt"?? along with the rear shafts. If I go to 4,000 RPM it goes away. The only experience I've had in the past with this type of problem was a 70 Z/28 that I bent the driveshaft in. Other than that the car is real strong. The PO who I know has put $16,000 into it over the time hes owned it. Any idea of where to start to track this down?? Thanks
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Drive train viberation (2/8)
 4/16/08 8:00am
Adams' AppleLifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


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If it is RPM dependent, it will be engine/flywheel related.
If it is speed(mph) dependent, it will be driveshaft/halfshaft/tire related.

Usually, engine or flywheel vibrations are constant, meaning it's always there, just worse at certain rpms. You can also get the vibration without the car moving, if you raise the rpms.

Driveshaft/tire, or "speed" dependent vibrations can come and go at different speeds, and may get worse, or better at times. This type of vibration will only happen while the car is moving.

You say it "comes and goes every 1/4 second"...1/4 second??? You've got a good sense of timing if you can count that fast!

From your description, I'd say start looking at the driveline first.

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Drive train viberation (3/8)
 4/16/08 9:18am
lbbounder
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Florence, KY - USA

Vette(s):
1977 Coupe; yellow, 4 speed, one option car with original engine


Joined: 9/9/2007
Posts: 143

I agree with Adam, years back I had a vibration issue in another car. After balancing the tires, then purchasing new tires, brakes and turning the drums, (it was a '64), at the end of all that I replaced the tube in the driveshaft and the vibration went away. ...so it probably is in the drivetrain

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Drive train viberation (4/8)
 4/16/08 9:52am
zgator
Former Member

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Savannah, GA - USA

Vette(s):
1982CE,32,000 and counting. (fast!!) 1981 Vette, black on black. ZZ4 (quick!!)


Joined: 1/20/2005
Posts: 936

[QUOTE=Adams' Apple]If it is RPM dependent, it will be engine/flywheel related.
If it is speed(mph) dependent, it will be driveshaft/halfshaft/tire related.

Usually, engine or flywheel vibrations are constant, meaning it's always there, just worse at certain rpms. You can also get the vibration without the car moving, if you raise the rpms.

Driveshaft/tire, or "speed" dependent vibrations can come and go at different speeds, and may get worse, or better at times. This type of vibration will only happen while the car is moving.

You say it "comes and goes every 1/4 second"...1/4 second??? You've got a good sense of timing if you can count that fast!

From your description, I'd say start looking at the driveline first. [/QUOTE] Adam, I'm hurt!! You know I work in the Aerospace ind. I can count things in my head into the thousandth's and won't be off but a tick. LOL!!!!. Really, I can see in my reivew- mirror the comming and going of the vib. it gets clear and vib. back and forth in less then a second interival. I'll check without a load and see if it's still there.LOL
Drive train viberation (5/8)
 4/16/08 5:49pm
ranger3Lifetime Member
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North Charleston, SC - USA

Vette(s):
1975 L48 AT AC T-top


Joined: 3/20/2004
Posts: 4176

Michael,

Do you work at Gulfstream?
Drive train viberation (6/8)
 4/16/08 8:48pm
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.


Joined: 8/27/2007
Posts: 2484

Hey 'Gator,
Lem'me know what you come up with on this.
My '79 does the same thing.
 
Kevin
Drive train viberation (7/8)
 4/17/08 5:52am
zgator
Former Member

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Savannah, GA - USA

Vette(s):
1982CE,32,000 and counting. (fast!!) 1981 Vette, black on black. ZZ4 (quick!!)


Joined: 1/20/2005
Posts: 936

[QUOTE=ranger3]Michael,

Do you work at Gulfstream?
[/QUOTE] Yes I do. 22 Yrs.
Drive train viberation (8/8)
 4/17/08 5:57am
zgator
Former Member

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Savannah, GA - USA

Vette(s):
1982CE,32,000 and counting. (fast!!) 1981 Vette, black on black. ZZ4 (quick!!)


Joined: 1/20/2005
Posts: 936

The problem is speed related. If there is no load theres no viberation. I guess I'll start with the east stuff, like checking to see if I lost a wheel weight. I remember taking a test drive in it before we made the deal and it a smooth at that time. That was last sat. I brought it home and didn't drive it until the next day and I don't remember it doing it then either. I'm not sure when it started. This morning I kept an eye in the tach. It starts around 2500 and goes away around 3200.
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