Drivetrain vibration

[Michael B.]

Re: Drivetrain vibration

If you have a copy of the Winter 2009 Restorer you can read my vibration story on my 1969 427.

You can further isolate your vibration by checking at various engine speeds with the car stopped and in neutral. Check with the clutch both in and out. With the clutch in you are checking engine, flywheel and clutch cover. With it out you are adding the friction disk, transmission input shaft, pilot bushing, front bearing and counter cluster.

[Edward J.]

Re: Drivetrain vibration

Mike, alot of good advice, my two cents would be to look at the u-joints on the drive shaft and half shafts, which when gone will give you driveline vibration.

another thing that can be done to isolate engine from transmisson, or driveline. is note the rpm when the vibration starts when moving down hwy. then use that rpm range when stopped, slowly increase the rpms to that exact RPM range to see if theres a vibration, transmisson should be in neutraL, If there is a vibration then your looking for a engine related problem (this would inc.the flywheel and clutch pressure plate).

good luck, Ed

[Richard G.]

Re: Drivetrain vibration

I would certainly pull the drive-line and check out all the u-joints. Go for the obvious first and work back to the difficult and rare stuff. Don't just look. But get it out so you can determine if the joint are hanging up or frozen up etc.
Could get the balance and straightness checked out at the same time by a drive line specialty shop. Do a visual on the rear ones and for gosh sakes also look into the rear bearings. Jack the car up at the outer edges of the spring and check the radial and axial play of the bearing. Just went through that and things are not always what they seem. Should not take to long to do this checking. Let us know what you find.
Rick