Springs - Rear

The rear springs came in four versions depending upon the body style and whether it came equipped with the increased rate Special Handling Package (SHP).

Rear springs can be identified by the part number stamping and paint dots or stripes. Below are some examples. The first picture shows the part number followed by 16  6E. It's currently believed that the (16) identifies the day of the year, in this case January 16th. And the (6E) identifies the year (6 being 1966) and the plant (E).

If you haven’t done anything to your leaf springs yet, try soaking them in Evaporust. It can be found at your car parts store. It will clean up the surface rust on the springs, and will enhance the paint markings.

Below is a table of information for rear springs:

Rear Springs – 4 leaf – 2-1/2” wide
Model	Load Rate	Spring Rate	Deflection	Markings	Build Sheet Code
Standard Coupe Part # C5ZZ-5560-C	610 lb.	85 lb.	7.176	C4ZA-5556-C-E-M-T (2) white dots/stripes	W
SHP Coupe Part # C5ZZ-5560-F	610 lb.	110 lb.	5.545	C4ZA 5556-H-J-R-V (2) red dots/stripes	Y
Standard Convertible & Fastback Part # C5ZZ-5560-D	650 lb.	85 lb.	7.647	C4ZA-5556-B-D-F-N-U (2) green dots/stripes	X
SHP Convertible & Fastback Part # C5ZZ-5560-E	650 lb.	110 lb.	5.909	C4ZA-5556-K-L-S-Y (1) green & (1) yellow dot/stripe	Z