I currently have a track school kit with 6” springs with 440/540. I am curious to experiment with some slightly lower spring rates…more around the 400 level. If you have 7” springs that is ok too. If you are interested in selling, please let me know. Thanks.

There's nothing special about GC springs. You can use any spring you want as long as it's the correct diameter for your spring seats. Springs are cheap...just buy another set.

There's nothing special about GC springs. You can use any spring you want as long as it's the correct diameter for your spring seats. Springs are cheap...just buy another set.

I feel you, but according to GC, they are $59ea. So you are looking at $240 without shipping...for an experiment.

GC uses 2,5" Eibach ERS FYI. As Bryan states any 2,5" will work but do be careful of coil bind when determining length/rate - it can lead to more issues than the obvious loss of control.

I have some 650 6" for sale $75 shipped.