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Posted by: LCOX May 28 2019, 02:20 PM

Anyone know how to determine the "spring rate" on rear suspension coil springs.
-The ones that I just took off my car appear to be the stock ones and I've heard are either 90 or 100lb springs.
-The aftermarket ones I have here feel stiffer to push down. They are painted yellow and I don't see any markings on them. They are also several inches shorter than the stock ones that came off the car.
-Any way of know what pound springs these yellow ones are?

Posted by: Mark Henry May 28 2019, 02:51 PM

https://www.thespringstore.com/spring-rate-calculator.html

Posted by: roblav1 May 28 2019, 03:45 PM

I've used a 400 lb digital postal scale in a drill press. Weigh the spring first!

Posted by: dr914@autoatlanta.com May 28 2019, 03:52 PM

the old yellow ones were made by pacesetter and were rated at 120 lbs

QUOTE(LCOX @ May 28 2019, 01:20 PM)

Anyone know how to determine the "spring rate" on rear suspension coil springs.
-The ones that I just took off my car appear to be the stock ones and I've heard are either 90 or 100lb springs.
-The aftermarket ones I have here feel stiffer to push down. They are painted yellow and I don't see any markings on them. They are also several inches shorter than the stock ones that came off the car.
-Any way of know what pound springs these yellow ones are?

Posted by: Dave_Darling May 28 2019, 09:00 PM

The original stock springs were in the 50-65 lb/in range.

You can measure the spring rate; it is pounds of force divided by inches of compression. Put weight on it, measure how much shorter it gets.

--DD

Posted by: tomeric914 May 29 2019, 12:01 PM

QUOTE(Dave_Darling @ May 28 2019, 10:00 PM)

You can measure the spring rate; it is pounds of force divided by inches of compression. Put weight on it, measure how much shorter it gets.

Also take a look at the link in my signature on how to put together your own spring combo that is fully adjustable.

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