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Murray, your ideal rear spring rate will depend on your front rate and the size of your front and rear bars. I wouldn't change anything until you drive it. Of all the things you have done, the Panhard bar may make the most difference. It dramatically lowers the rear roll center. George mentioned running larger diameter rear springs on modified spring perches he got from Jack. There are 2 other good alternatives. Left Hander chassis sells an adjustable spring perch that can be welded onto your trailing arms. It allows the car to be "scaled" and allows the use of cheap aftermarket springs. The other option is the one I chose. I welded Coleman shock mounts onto the trailing arms. Then I made aluminum adaptors to allow a 2.5" spring to seat into the normal upper spring seat. These two modifications allow the use of threaded coil-over shocks. It's not a true coil-over set up since the spring still seats on the body at the top. But having the bottom spring seat on the shock allows very easy scaling and ride height adjustment. Plus 2.5" coil over springs are cheap.
Erik
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