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Discussion Starter #1
Hi, i changed my coil on my 66 gt fastback for new GT coil (MC1252 from eaton)

the coil are on the car since 2 month (waiting on finishing other thing in the restoration)

the car sit now really really high, look ugly as hell. I taught that they were going to settle but its not happening.

anyone ever had this issus? how did you fixed that?
 
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Start with a search. There is a lot of info on new coil springs. Since you got them from Eaton, you got the best. But what else did you do when you installed them? Were other suspension components replaced? Did you tighten them with the car in the air? But also, you have not driven it yet . . . .
 

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Discussion Starter #3
i have change EVERYTHING on the car.. the front is so hight right now we cant bolt the shock..

i just saw on eaton website to cut them to desired height.

my mechanic wanted to heat them wich i dont want..

https://www.eatondetroitspring.com/cutting-coil-springs/

i think ill go that way.
 

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With EATON and the prices they charge, (and the quality they
supposedly represent), you shouldn't be cutting anything.
Like Pete says, you'll need to roll the car to settle the suspension
and know that you didn't torque lower control arm nuts when
the car was in the air and the lower arms were hanging down.

A photo or two of your car would be nice. I'm an original
"owner" & have a pretty good idea where the GT's sat when new.

The shock is the limiting piece in the front suspension that keeps
the arms from dropping as far as they normally would....
But you shouldn't be sky high with the shocks disconnected.

ex-Global West GM
1991-1995
 

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^What he said.

They are a long spring, (like around 17" out of the car) but something
else is going on if the complete engine is actually in that car.....

I found this other post from you-

http://forums.vintage-mustang.com/7637761-post1.html

New part had 2" more free length then the spring you removed?
And a different number of coils. Wonder what the wire diameter is
on the new spring.

ex-Global West GM
1991-1995
 

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I had a similar issue, although not quite as bad, where I installed new maier racing coil springs and it jacked up the front end several inches higher. I ended up having to cut almost half a coil to get the ride height back down to where I wanted it. I have .620 coils on my car but I think they were only about 11-13" and not 17" like yours.
 
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