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Old 05-08-2006, 11:16 AM
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Sizing Front coil springs

I have a 1939 Ford pickup with a 351W and a Ford AOD. I am running 1 1974 to 1977 Mustang front end (or maybe bronco II), it was in the truck when I bought it. The front coil springs are not very stiff and I would like to upgrade to a higher rate. I want to make the springs stiffer and raise the truck up 1-2"

The springs I have have the following qualities
rod diameter 1/2"
Number of coils 7
Spring diameter 5-1/2" outside
Total compressed height 8-3/4" top to bottom
Spacing between coils is 3/4"
All dimensions are approximate

Can you give me the spring rate for the springs that are in the truck now based on this information?

If yes, what spring should I use to increase the suspension and lift the truck?

Is there a simpler way for picking the front springs?

Any help on what I should but is greatly appreciated

JNJO39

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Old 05-08-2006, 11:40 AM
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Here it is!! This will tell you the approximate spring rate you now have and then you can select a new spring to suit..

Here is another one

Between these two articles you should be able to do what you need to do..I will say that suspension tuning is as much an art as it is a science..

Sam
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Old 05-08-2006, 12:13 PM
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Thanks Sam, it looks like these will be very helpful, and should get me started

Thanks again
JNJO30 (Jim)
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Old 05-08-2006, 05:26 PM
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-MUSTANG II SPECIALTY SPRINGS-
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Old 05-09-2006, 03:57 AM
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KULTULZ,
Thanks for the information. I looked at it last night an I think it will be very helpful

JNJO39
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