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1st Generation 1964 1/2 - 1973 - Questions & general discussions that apply to a specific year => 1966 Mustang => Topic started by: Hipo giddyup on February 19, 2018, 03:21:31 PM

Title: 1965 1966 leaf spring application- C4ZA-N's
Post by: Hipo giddyup on February 19, 2018, 03:21:31 PM

 I've been searching through some old leaf spring posts on the site but am not finding what I'm after. I recently picked up a set of original leaf springs with the following stampings on them. I am trying to figure out what specific application these would go with- V8, I6 - C4, 3 spd,? etc... Thanks for any help.

C4ZA5556N    &    C4ZA5556N
    45  6E                 65  6E

Title: Re: 1965 1966 leaf spring codes
Post by: ChrisV289 on February 19, 2018, 04:30:19 PM

I believe the N springs are for fastbacks and convertibles with 6 cyl and 8cyl.

Title: Re: 1965 1966 leaf spring codes
Post by: jwc66k on February 19, 2018, 04:41:55 PM

You could (hint) download your own MPC - http://squarebirds.org/Manuals/1965/1965-72FordPartsTextCatalog/ and verify a lot of similar questions.
Jim

Title: Re: 1965 1966 leaf spring codes
Post by: J_Speegle on February 19, 2018, 05:51:40 PM

Quote from: ChrisV289 on February 19, 2018, 04:30:19 PM

I believe the N springs are for fastbacks and convertibles with 6 cyl and 8cyl.

Believe that this could be better worded as "The -N rear springs used during 65-66 were one of the rear springs used on fastbacks and convertibles"

Title: Re: 1965 1966 leaf spring application- C4ZA-N's
Post by: Hipo giddyup on February 19, 2018, 09:44:06 PM

Trying to figure out why the N designation would be unique to fastbacks or convertibles? And would the 6E denote a June 66 assembly?
Darn, I was hoping to use these on my 1966 Dearborn coupe ( build appr. July 21st)  :(

Title: Re: 1965 1966 leaf spring application- C4ZA-N's
Post by: J_Speegle on February 19, 2018, 09:57:41 PM

Quote from: Hipo giddyup on February 19, 2018, 09:44:06 PM

Trying to figure out why the N designation would be unique to fastbacks or convertibles?

Likely laden weight since it was greater for both those cars when compared to a coupe with the same suspension packages and what the engineers penciled out

Body style is just one of many things that can affect originally assigned front or rear springs. For the fronts even the option of PS can make a difference.  Again something that would add some additional weight to the front end of the car

The last printed version of the MPC lumps all the following together for a non- K code application for replacement spring purposes .  No mention of handling package cars or any other original variations. IE the possible reasons for all the different code variations

C4ZA-C, E, M, T

Quote from: Hipo giddyup on February 19, 2018, 09:44:06 PM

And would the 6E denote a June 66 assembly?

No as the article in the Library reminds us - they were using the Julian calendar pattern for the dating of these   

So in your example the 45th and the 65th days of the year.