New Vibration

[scoopyg]

Hello.  My '75 has developed a low vibration at all speeds.  I have raised the car and removed the wheels, and run the car in all gears.   I used a "stethoscope" to listen to all the joints and bearings, and nothing really sounds amiss.  I wasn't able to listen to the carrier bearing.   The vibration feels like something is out of round, and similar to an out-of-balance driveshaft or bad U-joint.   Any thoughts on what is causing this vibration?   Thanks for any help.

['76mintgrün'02]

Does "low" refer to the frequency, as in slow.

 

Does does the vibration frequency vary with engine speed / or how fast the car is traveling?

 

 

Edited January 26, 2018 by '76mintgrun'02

[jimk]

Read up, double cardon shaft.

https://en.wikipedia.org/wiki/Universal_joint

[kbmb02]

1 hour ago, scoopyg said:

Hello.  My '75 has developed a low vibration at all speeds.  I have raised the car and removed the wheels, and run the car in all gears.   I used a "stethoscope" to listen to all the joints and bearings, and nothing really sounds amiss.  I wasn't able to listen to the carrier bearing.   The vibration feels like something is out of round, and similar to an out-of-balance driveshaft or bad U-joint.   Any thoughts on what is causing this vibration?   Thanks for any help.

 

If this came on fairly suddenly, check the tires. -KB

[zinz]

Guibo in good shape?

[Buckeye]

That's what happens when you move the car from Ohio to Florida...

Inspect Giubo, Center Support Bearing and U-joints.  

[Schnellvintage]

Check driveshaft bolt/nut where the two halves meet up at center bearing. If it loosened up can cause similar condition..
Matt


Sent from my iPhone using Tapatalk

[2joejoe2]

If all else fails, it might be the clutch pressure plate.  I had a very similar issue turned out I broke the straps on the 215mm sachs PP....fairly common problem on the POS 215 sachs pp 

[2joejoe2]

Forgot to mention you can obviously rule out the pp if the car doesn't vibrate when not in gear and not moving. 

[PaulTWinterton]

How about a simple scenario?  You dropped a balance weight off one of your rear wheels. It happened to me and I freaked out.  I was sure something major was broken.  The whole car vibrated.  The vibration started at 50mph though.   It would take a very bent wheel or crappy tire to cause vibration at all speeds.

 

What about the center muffler touching (vibrating against) the bottom of the car at the rearmost corner below the rear tunnel/passenger footwell?

 

Worth a look.  Good luck.

 

 

[scoopyg]

Many thanks gents for your suggestions.  And Hello Farshid in Dublin!  Good to hear from you my friend.  

 

 I ruled out the tires as I had the car up on jackstands with tires off and drums removed.  The vibration isn't present as the car is revved when up on jackstands in neutral, but is present when in gear.  By "low", I mean a low-pitched vibration.  It's really pronounced at 35mph.  Again, it is present at all speeds, but is less noticeable at highway speeds. The shifter vibrates annoyingly.    My instinct was the center driveshaft bearing, and I have access to a lift, so I guess the next step is to lift the car and inspect the center bearing, which was difficult to access without a lift. 

 

Thanks again for all your suggestions.  I appreciate all your thoughtful insights and non-condescending answers (if you get a V8 Buick, you'll see what I mean!)  This is far and away the best old-car forum on the internet.

[Mucci]

On 1/26/2018 at 3:12 PM, scoopyg said:

Many thanks gents for your suggestions.  And Hello Farshid in Dublin!  Good to hear from you my friend.  

 

 I ruled out the tires as I had the car up on jackstands with tires off and drums removed.  The vibration isn't present as the car is revved when up on jackstands in neutral, but is present when in gear.  By "low", I mean a low-pitched vibration.  It's really pronounced at 35mph.  Again, it is present at all speeds, but is less noticeable at highway speeds. The shifter vibrates annoyingly.    My instinct was the center driveshaft bearing, and I have access to a lift, so I guess the next step is to lift the car and inspect the center bearing, which was difficult to access without a lift. 

 

Thanks again for all your suggestions.  I appreciate all your thoughtful insights and non-condescending answers (if you get a V8 Buick, you'll see what I mean!)  This is far and away the best old-car forum on the internet.

ever figure this out?

['76mintgrün'02]

I think Scoopyg sold his car.

 

 

 

[TobyB]

No.

 

It drove him to distraction, and then he sold it out of frustration.

 

t

totally made that up.