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Topic: vibration

in Forum: C3 Driveline Components


vibration

Posted: 4/28/04 6:39pm Message 1 of 5
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Joined: 4/22/2004
Posts: 2
I've got a 79 vette with an automatic. It has a mild vibration starting at 40 mph. When I drop it in nuetral it stops. I've checked wheel bearings and u-joints, all seem good. Tranny slip yoke has a little slop. Could this be my vib??

Thanks
Gary |blinkyeyes| |blinkyeyes|


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vibration

Posted: 4/29/04 6:36am Message 2 of 5
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
Posts: 6424
Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!
The slip yoke is possible. But a j-joint with no slop can be dry, and could still be the problem. If that's the case it will have slop sooner or later. Best to fix before that happens if that's the case. Don't forget to check the rear shaft joints.
You could also have a weak motor or transmission mount.
Another possibility is and exhaust components misaligned or weak hanger.


vibration

Posted: 4/29/04 2:39pm Message 3 of 5
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Old Hickory, TN - USA
Joined: 5/26/2003
Posts: 599
Vette(s): 1978 L-82 Silver Anniversary hotrod. /////////////
Gary,

One simple possible fix..... My exhaust pipe got up against the cross member where it passes through, drove me nuts till I found it. I added a flex hanger to pull it away from the frame... Smooth as silk...... well..... as smooth as a '78 Vette can get......

Dave


vibration

Posted: 6/20/04 7:23am Message 4 of 5
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NEWFANE, NY - USA
Joined: 9/9/2003
Posts: 3
Vette(s): 77 L48 Dark Cherry
I had the same vibration, all seemed ok 'till I removed the driveshft. Best to remove and check for dry joints and if the lock rings are seated properly. |eek|


vibration

Posted: 6/20/04 11:08pm Message 5 of 5
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Hot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
 kstyer said: The slip yoke is possible. But a U-joint with no slop can be dry, and could still be the problem. If that's the case it will have slop sooner or later. 


I wholeheartedly agree... i just replaced all four joints on my truck a few weeks ago... they had no play. but i had a vibration that started about 40 or so.

the bearings in most of the joints were solid rust... when i pulled them apart they pratically disintegrated.. and yet there was no play...

if you do not know for certain that the joints have been replaced in the last five years.. then do it.

u-joints are definitely on my "if in doubt, throw it out" list. they are going to go out sometime.. and if you ever seen what happens when you drop the front of a drive shaft at 70 mph... youll understand..


in Forum: C3 Driveline Components


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