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1961 - 1966 F-100 & Larger F-Series Trucks Discuss the Slick Sixties Ford Truck

Font coil spring rate

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Old Dec 18, 2013 | 04:13 PM
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Font coil spring rate

Ford had three springs for F-100-250 in 1966.


1055 lbs (I-6's only).

1175 lbs. (I-6 or V8)

1250 lbs. (V8 only).

Can anyone tell me if that rating was per spring or per pair?

Thank You!
 
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Old Dec 18, 2013 | 06:13 PM
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That has to be per spring. Other wise the front end would be bottomed out with just the weight of the truck.
 
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Old Dec 18, 2013 | 08:08 PM
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I removed the front springs from my 66 f100 & one spring has larger diamiter than the other? It sat perfectly level before ?
 
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Old Dec 18, 2013 | 08:51 PM
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I believe that is normal
 
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Old Dec 18, 2013 | 09:27 PM
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Originally Posted by mike k m
I removed the front springs from my 66 f100 & one spring has larger diamiter than the other? It sat perfectly level before ?
Maybe because the engine is offset to the passenger side a couple inches?
 
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Old Dec 18, 2013 | 09:36 PM
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Ya that must be the reason, I would assume the the thicker coil should go to passenger side
 
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Old Dec 18, 2013 | 09:46 PM
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That is correct. This chart for 1966 gives all the rates. If you look at the column headings it is per spring. It also gives the left hand and right hand for deflection rates for the front springs. Passenger side is heavier spring. But only on the 2WD trucks and not the 4WD trucks. And opposite on the Bronco - heavier springs on drivers side.

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Old Dec 19, 2013 | 07:38 AM
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Thanks guys!
I really appreciate your input.
The gentleman at Eaton Spring said their HD spring was rated at 1750 per pair.
My springs are the 1250 lb ones but they are wore out.
I would like to find springs in the 1450-1500lb each range.
I don't want to raise my truck beyond stock ride height.
I am not concerned about the ride.
For the last thirty years I have been driving 350's and a 450.
I-beam to bump stop clearance is 1 5/8.
I would like for it to be 2 1/2 or so.
 
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Old Dec 19, 2013 | 06:04 PM
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Im going with these.

http://www.summitracing.com/parts/mo...l/f-100-pickup

When I get around-to-it.
 
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Old Dec 19, 2013 | 10:30 PM
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Originally Posted by Shadowrider123
Im going with these.

http://www.summitracing.com/parts/mo...l/f-100-pickup

When I get around-to-it.
I went with those also on my F100/I6. I thought my old springs after 49 years holding up their job was enough. They added about a 1-1/4' lift. Just enough to make the truck level empty.
 
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Old Dec 20, 2013 | 07:11 AM
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Originally Posted by HydroDog
I went with those also on my F100/I6. I thought my old springs after 49 years holding up their job was enough. They added about a 1-1/4' lift. Just enough to make the truck level empty.
Cool.

Im putting off a bunch of projects that I want to do because the truck is running and driving so good Im scared to fix something that isn't broke.
 
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Old Dec 20, 2013 | 07:19 AM
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Thanks Guys!
 
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Old Dec 21, 2013 | 02:00 PM
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Originally Posted by Blackwaterforge
Ford had three springs for F-100-250 2WD in 1966.

1055 lbs (I-6's only) / 1175 lbs. (I-6 or V8) / 1250 lbs. (V8 only).

Can anyone tell me if that rating was per spring or per pair?
Ask and ye shall receive...
 
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Old Dec 23, 2013 | 08:05 AM
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Thanks ND!
You are always a big help.
 
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