66 coupe vibration

[Joe Clarino]

I have a 66 coupe apun excelleration has a vibration in the front to middle of the car. I have replaced the tires and had it aligned with no results. It feels as if it is a broken trans mount( It's Fine) or an unbalanced driveshaft. Has anyone experienced this or have any ideas what it could be?
Thank you
Joe

[Wayne K.]

Re: 66 coupe vibration

Joe,

Have you checked the motor mounts ?

[Wayne C.]

Re: 66 coupe vibration

Also, check the front differential mount cushion.

[John M.]

Re: 66 coupe vibration

Also, check the play in the transmission rear yoke/bushing. I've had this problem with the same symptoms. Good luck.

[Joe Clarino]

Re: 66 coupe vibration

Yes I have. No Problem.
Thanks

[Jeffrey S.]

Re: 66 coupe vibration

Joe
I had a similar problem on my 69 many rears ago except that the vibration only occured over 3500 RPM. The culprit turned out to be a bad fan clutch. At that time I replaced the original fan clutch (which I saved and had restored a couple of years ago)and fan with new GM units. The problem was solved. Many years later I had the original rebuilt and restored and re-installed the original fan and everything works beautifully.
Hope this helps.
Jeff Salz