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Print in friendly format Send this term to a friend  St Louis
St Louis, MO, is the location of the Corvette assembly plant from 1954-1981.

Since 1981, Corvettes have been assembled in Bowling Green, KY.
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Steve40th Driveline Vibration,
Elite Guru
1114 Posts
Member since:
2005/12/20 0:00



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93 C4, Okay, at 2500 rpm and at 4500 rpm I have a vibration under medium to heavy throttle. Does not matter if AC is on or not.
In neutral, or park, the problem is not there.
Had main drive shaft checked. Good, and balanced.
Half Shafts have zero movement, and as driveshaft, has spicer u joints. They are a few years old, but very few miles.
I replaced end links on rear sway bar. Rubber was gone.
Hal Shocks, no leaks.
DRM Long tube headers since 2001 era, and OEM cat back exhaust.
700R4/4L60 Pro Built Automatic with Vigilante 2800 stall
New tires.
Center beam has ZF Docs plates, and they are torque per FSM.
When you get on it, half or full it feels like something is vibrating/hitting the floor boards. Feels like exhaust is hitting. But, when I was under there, I cant see where the exhaust could be hitting. Maybe under torque, it is. Motor mounts are tight, I just did that a couple days ago.
So, thats all I can think of.
Thoughts, suggestions?
Posted on: 5/24 23:02
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Matatk Re: Driveline Vibration,
Webmaster
SW Chicago Burbs
22671 Posts
Member since:
2008/1/7 0:00



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How old are the tires? They can cause problems that mimic drive line issues.

You might need to put the car in the air and run it with the wheels off the ground to isolate the issue.
Posted on: 5/25 12:44
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc.
1989 Corvette...RIP
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Steve40th Re: Driveline Vibration,
Elite Guru
1114 Posts
Member since:
2005/12/20 0:00



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Tires are about 8 months.
Tested more.
Vibration in all gears same rpm.
Pushed brake to see iff TCC disengaged, it did.
Torque braked a bit at stop, and vibration is present.
Opened hood, went back and forth with reverese to drive. Engine Barely moved. Idles at 800rpm.
In nuetral nothing.
Posted on: 5/25 12:48
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Matatk Re: Driveline Vibration,
Webmaster
SW Chicago Burbs
22671 Posts
Member since:
2008/1/7 0:00



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Is it making any noises? Next step might be to pull the inspection cover off the trans and make sure torque converter bolts are tight and there are no cracks or missing weights on the flex plate. Was it balanced when you did the motor / trans?
Posted on: 5/25 12:57
_________________
2002 EBM convertible, Magnusson supercharger, cam, headers, etc.
1989 Corvette...RIP
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Steve40th Re: Driveline Vibration,
Elite Guru
1114 Posts
Member since:
2005/12/20 0:00



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Cover is off. Bolts are on converter to flexplate.
Exhaust is not touching in reat near differential.
I will jack it up and get under it
Posted on: 5/25 13:13
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