Re: vibration at 65 mph?

[Eric Sturgis <ericsturgis@xxxxxxxxx>]

IMHO it's one of the new drums out of balance.  Take one side off the car, put it on a bubble balancer....if it is not balanced, return it and get another one....or try to balance it yourself if you are brave enough, either with welding on a iron weight or better yet grinding off a little bit on the heavy side (I would return it and get a new one).  I have seen unbalanced drums before do this and been as much as 3 OZ off weight.  They are tested at the factory...or they used to be.  You all may remember seeing weights that are welded to the outside surfaces of some of your drums....those are the ones that needed it.  Good luck. 

 

Eric

PS I've include a photo of a drum with no weights on it and one with a weight on it. 

On Thu, Jul 14, 2011 at 9:27 AM, Bill Paxton <wmp4@xxxxxxxxxxxx> wrote:

Maybe try backing off the shoes to see if it is the drums? Is it in the front?

 

From: 1962to1965mopars@xxxxxxxxxxxxxxxx [mailto:1962to1965mopars@xxxxxxxxxxxxxxxx] On Behalf Of waedison@xxxxxxxxxxx
Sent: Thursday, July 14, 2011 11:54 AM
To: 1962to1965mopars@xxxxxxxxxxxxxxxx
Subject: Re: vibration at 65 mph?

 

 

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From: "Jim Altemose" <jaltemoose@xxxxxxxxx>
To: 1962to1965mopars@xxxxxxxxxxxxxxxx
Sent: Thursday, July 14, 2011 8:03:18 AM
Subject: vibration at 65 mph?

On my 63 Polara 500 I recently replaced my front drums, brakes and
bearings.  I'm now getting a 'vibration' between about 62 and 68 mph.
On my recent 500 mile journey to Carlisle I had plenty of chance to
feel the symptom.  Up until 60 mph, the car is smooth as silk.  At
about 62 and up to 68 or 70, I get a noticeable, general vibration.
It's not terrible and doesn't feel damaging or unsafe, but it's enough
to be annoying.  From 70 to 80, it lessens and is barely noticeable
and much more tolerable.  Here's the sequence of things I've done:

1. Old tires, old drums, etc. - Smooth at every speed.
2. Replaced front hubs, drums, shoes, springs, bearings.  Used what I
think are high quality American made brand new drums and Timken
bearings.  This is when the 65 mph vibration became noticeable,
including with the old tires.
3. Replaced the old tires with new BFG radial T/A.  Still vibrates.
The new tires and wheels were balanced.
I'd recheck the wheel balance IF you are feeling it through the steering wheel, it's the front tires. If you are feeling it through the seat, it's coming from the rears. You can check this by rotating the tires front to rear, see if the vibration changes. Worn front end parts will also cause this, but since you didn't feel it before, I would discount this for now.

 

Another thing that will cause this is a tire being out of round, but that generally shows up through all speeds. Vibration just in one speed range... generally wheel balance.

 

/Butch/Ferndale, WA

 

The control arms and bushings and such are all old and worn; that may
be next Spring's project.  The shocks are old and I'm going to replace
them soon.

What are some things to look for and what corrective actions can I
take?  Should I have an alignment done?  Is there a way to balance the
drums with or without the wheels and tires?

As always, thanks.

- Jim
Jim Altemose, Long Island, NY
'63 Polara 500 (Max Wedge)
'63 Polara 500 (383)
'65 Belvedere I (Street Wedge)
'71 Bronco

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