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Id like to use the Hypercoil as well. I've been also waiting to here any reviews on this spring and if the arch is too severe, like the TRW is.
If you bought it from Van Steel, maybe they can enlighten you-post sale .
On a side note, I put a new steel 9 leaf 2.5 inch wide spring (HD for 80-82) which I bought from Mid America on, and I needed to have a 9 inch bolt length (10 cut down), set to about max, to get a ride height of 28 1/4 inch with my 27 inch tall 255-60-R15 tires.
I have not used there spring. But I do feel that the 330 LB will be too lite. But it can not hurt to try.
Spring rate needs to be determined via different variables. Your main goal is key. Than you break it down from there on the type of ride quality your looking for, motor torque, car weight, tires, shocks (we think of shocks as the speed control of the platform).
The Hyperco EZ Ride spring is based off of a steel 9 leaf. A steel spring is just under 200#'s and the Hyperco EZ ride spring is 200#'s. A stock 7 leaf BB spring is 305#'s and the next spring rate up from a 200# Hyperco is their 330# spring. Just under a 10% bump from from the BB spring. This spring also has a lower arch than the 200# spring to achieve stock ride height but b/c it is a higher arch spring, 8" bolts are recommended.