What do you mean by there is an intercooler under your tranny? Is it a tip,if so then that's normal,they have there own little 'cooler'.
As for installing springs this is all I could offer;
http://gwl.rmsolo.org/hacks/suspension/
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-99' Zenith Blue 5-spd...didn't agree with a center divider on the freeway
-01' S Orient Red Metallic 6-spd...money pit...sold to buy a house