c3 vibration promlem
Thread Starter
5th Gear
Joined: Aug 2004
Posts: 5
Likes: 0
c3 vibration promlem
Ok guys, Need a little help. I have a 68 with a vibration problem. It happens at all speeds above 35 mph. Its coming from the rear. It also goes away when you let of the gas. I know u- joints. I replaced both drive shaft u-joints and put two new heavy duty 3 inch axles in from ecklers. I aslo pulled the rear and rebuilt that.I know my camber adjustment rods need to be replaced( worn bushings). I did notice the axles from ecklers have no weights on them. Balance axles? Is there anything else that could cause this problem? oh bearings are good.
Thanks for any advice,
C3NUT
Thanks for any advice,
C3NUT
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Originally Posted by c3nut
Tires are all new. bushings replaced when I rebuilt rear end. This is not tire vibration, tire vibration goes and comes this is flat out all the time.
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Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Originally Posted by c3nut
Tires are all new. bushings replaced when I rebuilt rear end. This is not tire vibration, tire vibration goes and comes this is flat out all the time.
Drifting
Joined: Mar 2003
Posts: 1,608
Likes: 3
From: Canberra AUSTRALIA
St. Jude Donor '05-'06
How about your main driveshaft. It is very hard for the short axle shafts to be out of balance, they are so short and thick and I really don't think they need weights on them. I had a horrible vibration and it was a combination of the following:
1. Unbalanced drive shaft
2. Worn yokes in differential
3. One rear tire had a "flat" spot.
4. Muncie bearings worn out. rebuild fixed it.
There are many causes. It is very hard to find the source while you are driving in the car.
Good Luck hope yours is less painful then mine.
1. Unbalanced drive shaft
2. Worn yokes in differential
3. One rear tire had a "flat" spot.
4. Muncie bearings worn out. rebuild fixed it.
There are many causes. It is very hard to find the source while you are driving in the car.
Good Luck hope yours is less painful then mine.
Le Mans Master
Joined: Jul 1999
Posts: 9,206
Likes: 17
From: Sewell NJ
I had a vibration problem for years with my 74 and did everything that was said above. This past winter I replaced both trailing arms with offset units from Van Steel. When they inspected my old arms they found that one spindle was bent (.012 out). Once I got the new arms installed and running there was no more vibration. Take a dial indicator and check your spindles. It might save you a lot of unnecessary parts swapping and the money associated with it.
Thread Starter
5th Gear
Joined: Aug 2004
Posts: 5
Likes: 0
I will ck the spindles. As far as tranny bushings the were replaced. the tranny has less than 100miles on it I did a complete overhaul. motor trans,rear end, drive shaft, axles ft & rear springs all new. The vib comes in after 30-35 mph and stays. It rides perfect when I put it in neutral.
Race Director
Joined: Sep 1999
Posts: 11,360
Likes: 382
From: Plano TX
Sounds like the driveshaft. I had a new Z28 that did that except it was smooth until 80 mph. I had GM replace the steel driveshaft with an aluminum shaft from a 1LE Camaro (under warranty, no less) and the vibe was gone. When it vibrated I could push in the clutch and it would stop.
Race Director
Joined: Mar 2001
Posts: 11,322
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From: Living in the Hartland
Originally Posted by zwede
Sounds like the driveshaft. I had a new Z28 that did that except it was smooth until 80 mph. I had GM replace the steel driveshaft with an aluminum shaft from a 1LE Camaro (under warranty, no less) and the vibe was gone. When it vibrated I could push in the clutch and it would stop.
Always thought vibes with the clutch in would be in front of the trans (eng, flwwheel/flexplate, clutch/tc) or when engaged would be tranny back if no vibe when in neutral and reving at the same rpm's.
Last edited by Fevre; Aug 19, 2004 at 03:59 PM.
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Originally Posted by zwede
Thought so also but apparantly vibes increase the more power that is transmitted through the (unbalanced) driveshaft. I'm not a mechanical engineer so I can't explain it.
I was getting a bad vibe (no pun intended) in my formula at higher speeds but I found the rear u-joint and cap had been misaligned when assembled, vibe went down a lot once I fixed it but still have a little at higher speeds.
Thread Starter
5th Gear
Joined: Aug 2004
Posts: 5
Likes: 0
ok guys, here it goes. I took everything u guys said.Did some testing. Spindles ok. I then ck my camber with an old bubble gauge. Left was neg. rt was poss. I then replaced the camber rods (which I said were worn)and set both sides Poss. My vibration is gone.Thanks 2 all who replyed. Seems c3s need that poss. camber. Man it rides like a dream.
Thanks 2 all,
c3nut
Thanks 2 all,
c3nut