Quote:
Originally Posted by simpleisbest
Not to nitpick, but I don't recall seeing any published spring rates for the TRD kit. While everyone assumes it is the same as the Eibach kit, that still is only an assumption.
If you have any data on the spring rates, please share!!! 
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The suspension options thread lists rates for the TRD springs:
http://www.ft86club.com/forums/showthread.php?t=8739 although every other source I can find simply says "proprietary rates."
Granted, I don't know their source. I am operating off of that information, my own experience/knowledge of how the automotive aftermarket industry works, and the assumption that the springs are supplied by Eibach and very similar to the ProKit springs.
So I suppose I cannot be certain of the information and my assumptions, but I do believe it's a safe bet given informaton available.