Relative to 65/66 Mustang Coupes - Take a look at the top of the quarter panel right where the drip rail ends. Is it cracked? Then, you can see evidence that the unibody is flexing. That's a fatigue failure of a highly stressed point in the unibody structure. Fix that crack. Then, install some sub-frame connectors. Viola! No more crack...ever.
<font color="blue">On edit: The title of this post is "What does is take to twist a 65/66 Mustang". Actually, about 2300 ft-lbs per degree of twist for a coupe. A strong car (not a stock 65/66 mustang, mind you) will take 10,000 ft-lbs per degree of twist. I'm going for ~5000 ft-lbs per degree of twist on a highly modified "Project Hard Way".</font>
Robert
_________________
Beegshot
65 1/2 'stang, Hard Way
79 F100 SuperCab, parts hauler
03 Expedition, grocery getter, kid hauler
Henry Ford said, "If you find you need a tool, you have already paid for it."
<font size=-1>[ This Message was edited by: beegshot on 3/7/06 7:39am ]</font>
<font color="blue">On edit: The title of this post is "What does is take to twist a 65/66 Mustang". Actually, about 2300 ft-lbs per degree of twist for a coupe. A strong car (not a stock 65/66 mustang, mind you) will take 10,000 ft-lbs per degree of twist. I'm going for ~5000 ft-lbs per degree of twist on a highly modified "Project Hard Way".</font>
Robert
_________________
Beegshot
65 1/2 'stang, Hard Way
79 F100 SuperCab, parts hauler
03 Expedition, grocery getter, kid hauler
Henry Ford said, "If you find you need a tool, you have already paid for it."
<font size=-1>[ This Message was edited by: beegshot on 3/7/06 7:39am ]</font>