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Original Message
The wrong damper won't make it shake.
By Dave Shoe - 08/22/2001 1:18:52 AM; IP 216.243.158.52
FEs got a new standard damper design in 1968. It's 1.10" front to rear and looks way more massive than the earlier damper.

Your 1966 damper is correct for that car. It's the standard FE damper from maybe 1964 (I'm still studying this date) intil 1967 (I'm sure of this date). It's 0.75" wide and has a belt groove in it. Note that the three pulley bolts are positioned different;y than the 1968-76 damper, so early pulleys don't match with '68-76 pulleys.

Dampers mainly go to work above 4000-5000RPM, when the fourth, third, second, and first order crankshaft harmonics can become problems. Dampers are not responsive at your problem RPMs.

I assume the shaking is a problem when the car is in neutral as well as drive. It could be a loose damper ring (visually obvious), or perhaps a bad clutch, or maybe a bad fan blade. It could possibly be an odd piston. I can't help you too much, other than mention these basics.

Shoe.
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=7759&Reply=7759><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor7759" onclick="return false;">'66 390 Internal Vibration</a>&nbsp;-- <font color=#0000ff>Paladin, <i>08/22/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=7759', contentMargin: 60, icon: $('anchor7759') }); </script>  '66 390 Internal Vibration -- Paladin, 08/22/2001
Collapse <b>The wrong damper won't make it shake.</b>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>08/22/2001</i></font>The wrong damper won't make it shake. -- Dave Shoe, 08/22/2001
 RE: Dampner may not be the problem -- Mel Clark, 08/22/2001
 RE: '66 390 Internal Vibration -- BOB HOPKINS, 08/22/2001
Collapse <a href=../ForumFE/reply.aspx?ID=7777&Reply=7759><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor7777" onclick="return false;">RE: '66 390 Internal Vibration</a>&nbsp;-- <font color=#0000ff>Ray, <i>08/22/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=7777', contentMargin: 60, icon: $('anchor7777') }); </script>  RE: '66 390 Internal Vibration -- Ray, 08/22/2001
Collapse <a href=../ForumFE/reply.aspx?ID=7781&Reply=7759><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor7781" onclick="return false;">RE: '66 390 Internal Vibration</a>&nbsp;-- <font color=#0000ff>Mel Clark, <i>08/22/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=7781', contentMargin: 60, icon: $('anchor7781') }); </script>  RE: '66 390 Internal Vibration -- Mel Clark, 08/22/2001
 Not exactly. -- Dave Shoe, 08/23/2001
Collapse <a href=../ForumFE/reply.aspx?ID=7792&Reply=7759><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor7792" onclick="return false;">Internally balanced 428</a>&nbsp;-- <font color=#0000ff>Ross, <i>08/23/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=7792', contentMargin: 60, icon: $('anchor7792') }); </script>  Internally balanced 428 -- Ross, 08/23/2001
 RE: Internally balanced 428 Revisited -- Mel Clark, 08/24/2001
 What I'd do -- Ross, 08/23/2001
 First Thing I'd Check -- Skip C., 08/23/2001
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