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Marketplace => Wanted Ads => Topic started by: 266ks on April 24, 2016, 08:55:30 PM

Title: rear springs for a Dec 1964 built fastback
Post by: 266ks on April 24, 2016, 08:55:30 PM
I need a pair of bottom leaf springs for a Dec 1964 k-code fastback. Any lead would help.   
Title: Re: rear springs for a Dec 1964 built fastback
Post by: J_Speegle on April 25, 2016, 05:58:44 AM
Just to help a little - they will be marked C4AZ 5556  S and an appropriate date below that
Title: Re: rear springs for a Dec 1964 built fastback
Post by: jwc66k on April 25, 2016, 11:52:25 AM
Just to help a little - they will be marked C4AZ 5556  S and an appropriate date below that
Wouldn't that be C4ZA?
Jim
Title: Re: rear springs for a Dec 1964 built fastback
Post by: 67gtasanjose on April 25, 2016, 12:19:43 PM
Wouldn't that be C4ZA?
Jim

Ahh, come on! Cut the ole' dog some slack, Jim...look at what hour of the day he posted the reply  ;)
Title: Re: rear springs for a Dec 1964 built fastback
Post by: jwc66k on April 25, 2016, 04:40:18 PM
Just to help a little - they will be marked C4AZ 5556  S and an appropriate date below that
Wouldn't that be C4ZA?
Jim
Ahh, come on! Cut the ole' dog some slack, Jim...look at what hour of the day he posted the reply  ;)
Well, OK. C4AZ applies - except in California, the other lower 48 states, North of the Equator, South of the Equator and two small islands in the middle of the Artic Ocean.
Jim
PS - I'm older than he is anyway.
Title: Re: rear springs for a Dec 1964 built fastback
Post by: J_Speegle on April 26, 2016, 06:52:18 PM
Wow - dyslexia and ole' dog comments in the same thread   ::)

But its good we have prefect individuals here to help challenged old seniors around the home here   :'(

Must keep you busy   :-X
Title: Re: rear springs for a Dec 1964 built fastback
Post by: jwc66k on April 26, 2016, 07:31:15 PM
Wow - dyslexia and ole' dog comments in the same thread   ::)

But its good we have prefect individuals here to help challenged old seniors around the home here   :'(

Must keep you busy   :-X
What? You'll have to speak up. My hearing ain't what it used to be.
But as long as we're on the subject, what is the difference between C4ZA-5556-K, -L, -S and -Y springs? Ford Car Parts list all those 650 pound variations (replace by C5ZZ-5560-E which was discontinued as of May, 75) for Convertibles and Fastbacks (thru 66) with the "K" code engine. Hardtop HP's have their own series of four dash letters (and four non-HP), plus there is another 650 pound series of four dash letters for non-HP and I-6 Convertibles and Fastbacks.
I see possible answers as: date related (early, mid and late production); different vendors; different plants - what?
Jim
Title: Re: rear springs for a Dec 1964 built fastback
Post by: WT8095 on April 27, 2016, 08:57:53 AM
But as long as we're on the subject, what is the difference between C4ZA-5556-K, -L, -S and -Y springs? Ford Car Parts list all those 650 pound variations (replace by C5ZZ-5560-E which was discontinued as of May, 75) for Convertibles and Fastbacks (thru 66) with the "K" code engine. Hardtop HP's have their own series of four dash letters (and four non-HP), plus there is another 650 pound series of four dash letters for non-HP and I-6 Convertibles and Fastbacks.
I see possible answers as: date related (early, mid and late production); different vendors; different plants - what?

Some discussion here:

http://www.concoursmustang.com/forum/index.php?topic=12284.msg75376#msg75376 (http://www.concoursmustang.com/forum/index.php?topic=12284.msg75376#msg75376)

The differences are in spring rate, which is the distance a spring deflects under a given load and is listed in lb/in. Spring rate is not listed in the MPCs - instead, Ford used a unfortunately similar-sounding term load rate, which indicates how much weight the spring is designed to carry, but is not descriptive of the stiffness of the spring. For example, a 650 lb load rate spring that has 100 lb/in spring rate will give a soft cushy ride. A 650 lb load rate spring that has 300 lb/in spring rate is going to give a much firmer, maybe even harsh ride. Of course ride quality also depends on sprung weight vs. unsprung weight, but that gets into a much longer discussion...
Title: Re: rear springs for a Dec 1964 built fastback
Post by: 67gtasanjose on April 27, 2016, 09:13:19 AM
Some discussion here:

http://www.concoursmustang.com/forum/index.php?topic=12284.msg75376#msg75376 (http://www.concoursmustang.com/forum/index.php?topic=12284.msg75376#msg75376)

The differences are in spring rate, which is the distance a spring deflects under a given load and is listed in lb/in. Spring rate is not listed in the MPCs - instead, Ford used a unfortunately similar-sounding term load rate, which indicates how much weight the spring is designed to carry, but is not descriptive of the stiffness of the spring. For example, a 650 lb load rate spring that has 100 lb/in spring rate will give a soft cushy ride. A 650 lb load rate spring that has 300 lb/in spring rate is going to give a much firmer, maybe even harsh ride. Of course ride quality also depends on sprung weight vs. unsprung weight, but that gets into a much longer discussion...

A very good way to explain springs & various engineering designs. ;)

Dave, you have now become my "unsprung" hero!
Title: Re: rear springs for a Dec 1964 built fastback
Post by: WT8095 on April 27, 2016, 09:43:28 AM
Dave, you have now become my "unsprung" hero!

Where's the "forehead slap" emoji???   ;D