Hi weldvair - TCI usually sells a coil spring with their kit that is too high a spring rate. My buddy has the TCI IFS in his '52 Chevy 1/2 ton. The springs that came with the kit are 450lb spring rate. You only need a 350 lb spring rate if you are running a small block Chevy engine with either TH350 or TH400 tranny. The front end will never settle down with those springs you have. My buddy cut one coil out and it brought the front end down so that the lower control arms are parallel to the ground, which is what you want.
