One of the most difficult codes to break are the front springs. That's because there were many different applications to match up as the pages (above) from the Master Parts Catalog will illustrate. Then on 2/14/66 Ford changed the applications; which spring went with which options. That being said, it doesn't appear that they changed the part number - load rating - paint marking system they were using. What they did change was which options a particular spring was used for. At this point I believe that the build sheet codes specified a certain spring part number, and since this remained unchanged, the code remained unchanged as well. Therefore, I have begun the following table. I'm sorry but I don't have enough build sheets yet to provide the codes for the Green or Violet colored springs.
Code | Part Number | Load | Markings |
O | C5ZZ-5310-A | 1279 lbs. | PINK |
| C5ZZ-5310-B | 1344 lbs. | GREEN |
4 | C5ZZ-5310-C | 1490 lbs. | GRAY |
| C5ZZ-5310-D | 1413 lbs. | VIOLET |
W | C5ZZ-5310-E | 1491 lbs. | BROWN |
X | C5ZZ-5310-F | 1413 lbs. | RED |
In order to verify the paint markings on your springs, it may be necessary to soak them in Evaporust. Above are some photos of a green 1344 lb. spring. It may be necessary to confirm the actual spring used in order to verify what Ford installed. The MPC application table isn't enough of a guide; as Ford sometimes changed things for unknown reasons.
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