Springs are 6/7+ish, no wonder the ballance feels sooooo out of wack. Fronts are adjustabe, gas and any ones guess of brand at the moment. Although the rear a set are only a set of oil only TRD greens, at least they are adjustable. I've had them all out on the bench and seem to be in good order. I will have a hunt about for some 4kg rear springs today, any suggestions on ride height Chris?