Vibration?
Thread Starter
Instructor
Joined: Jun 2003
Posts: 156
Likes: 12
From: Arkansas
Vibration?
I need some help tracking down a vibration. The vibration is rhythmic or intermittent, not constant. Its at its worse from 2800-3000. Which is 65-70 on the highway. Its not noticeable below that and not as bad above that. I ran it in 2nd gear and got the same vibration at same rpm. which tell me its not in the shafts or joints(not speed related). I feel like its in the trans. but don't know a way to check without pulling it. I ran it in park and neutral, didn't feel any vibration.
thanks
72 coupe, 350- 400 turbo
history, last fall pulled engine and trans to freshen up. I had motor gone thru and balanced. I had trans gone thru at the same time to freshen it up while everything was out. all new u-joints last fall also.
thanks
72 coupe, 350- 400 turbo
history, last fall pulled engine and trans to freshen up. I had motor gone thru and balanced. I had trans gone thru at the same time to freshen it up while everything was out. all new u-joints last fall also.
Team Owner
Joined: Jun 2001
Posts: 23,381
Likes: 1,067
From: Virginia USA
I'm also thinking about taking the drive shaft out and have it balanced just to eliminate that.
Drifting
Joined: Aug 2009
Posts: 1,346
Likes: 160
From: new iberia la
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Intermediate
Joined: Sep 2014
Posts: 45
Likes: 9
From: Queensland
Had a vibration at those RPMs on my 78. Mine would shake the gear stick and make it rattle but I could make it happen by just revving the engine in neutral.
While diagnosing I removed the mechanical fan on the front of the motor and it went away.
Never put it back on and went to electric fans. Problem fixed.
While diagnosing I removed the mechanical fan on the front of the motor and it went away.
Never put it back on and went to electric fans. Problem fixed.
Thread Starter
Instructor
Joined: Jun 2003
Posts: 156
Likes: 12
From: Arkansas
update: I may have found the culprit. Friday i was headed to a corvette gathering about 225 miles away. At mile 170, the transmission gave out, low gear only(turbo 400). When it would try to shift into 2nd it would slip and rev up.
Last fall I had my engine out for gasket leak repairs and updates. While it was out, I took my trans to a local recommended shop for inspection and check-up. It had been working fine, but was 45 years old and should be looked at. When i put it back in, it didn't shift right. I took the car to same trans shop. He called and said it had shaving in it and had to be removed and fixed (again). He did, but I never felt it was right. This is why I've thought the vibration may have been in the trans. So I will replace this trans and then we will know if thats where the vibration was.
Last fall I had my engine out for gasket leak repairs and updates. While it was out, I took my trans to a local recommended shop for inspection and check-up. It had been working fine, but was 45 years old and should be looked at. When i put it back in, it didn't shift right. I took the car to same trans shop. He called and said it had shaving in it and had to be removed and fixed (again). He did, but I never felt it was right. This is why I've thought the vibration may have been in the trans. So I will replace this trans and then we will know if thats where the vibration was.
