Hi All, I am going to need to replace the rear springs on my 68 cutlass convertible. I'm hoping someone could tell me the pro's and con's of each type of spring and any recommendations. I am looking to improve handling a little while getting the ride height back to normal.

Thanks, Joe

 

Hi joe,

This is a good explanation of variable vs. stock springs:

http://www.federalmogul.com/en/After...n/CoilSprings/

 

Variable rate springs will allow for both a comfortable ride as well as keeping the rear more level when loaded down. These would be good if you carry a big family or go cruising with all your buddies in the back.

Simply replacing springs will often help get the ride level restored and reduce bottoming out, as the old ones will be fatigued and sagging.

I have found the new Moog springs to be stiffer than OEM originals. (Like the STD springs being a bit stiffer than the stock STD springs).
It is recommended to find out what your original spring's rates are by consulting the assy manual for your car. The moog spring rates are listed in one of the links below.
Those may help you decide on which to use.
Adding a sway bar and boxed control arms to the rear are recommended for greater stability, also.

https://classicoldsmobile.com/forums...tml#post170009

https://classicoldsmobile.com/forums...ancements.html

 

Thanks Rob, Great information! I like the idea of a more comfortable ride. It will mainly be my kids in the back seat if anything. I just don't want the car to lean over going around turns b/c the variable rate spring are too soft.

Joe

 

Actually the variable rate ones may be the firmest ones. They were for the rear of my '72. 175lbs vs 164lbs for the heavy duty constant rate. Sounds like you really want that sway bar setup. New bushings back there will add more stability, too!