HQ springs GM# 3955724

[Nova Research Project]

Camaro Don,

Thanks, Here is some more detail:

I show the specs for the HQ as:

Cut off length = 122.78
Wire Diameter = .628
Total Coils = 9
Rate = 345
Height Uninstalled = 16.45"
Installed Height @ 1830 lbs = 11.09"

All springs were designed to be 11.09" when installed. The "computer selected" spring was just fine tuned to the weight of the car with all the particular options.

There were 9 springs with the 345 rate. The differences are the wire diameter and the coil count needed to put the spring at 11.09" when the car was fully assembled with all options.

The shortest free height for the 345 rate springs was 14.97" and the tallest was 16.95". This is one of the reasons folks have a hard time with the generic 345 springs and body ride height. All 345 rated springs will do the job. The difference is the ride height you get.

Within reason, you could trim the generic springs to shorten the cut off length and lower the ride height. Alternatively you can install another higher or lower code to get a higher or lower ride height. My spring calculators use the parts book weights to specify the spring required to hit the factory ride height for that weight.

The springs sold by part number came on the scene several years ago to address the ride height problems found with the one size fits all generics. I do not recall who the manufacturer is for them. I doubt the retailers have the specs unless they measure them. They buy them based on part number or application.

Eaton will sell you an equivalent spring to meet the ride height you specify. They would not be able to always match the wire diameter and coil count that came on the car originally. However the spring <span style="font-style: italic">should</span> function fine with the correct ride height.

I hope this helps.
Greg