Cutting Hotchkis Coils

[Marcus SC&C]

Calculating the rate and height changes of the coils and it`s effect on ride height should work,but no matter how well the math is done it can still backfire. It`s a real pain but I still prefer to cut them 1/4 coil at a time,especially for small changes like 3/4". 1/4 coil will "probably" do it. The rear is a little more tricky. Maybe the easiest thing to do is call these folks http://www.coilsprings.com/ ,tell them what springs you`re running now and how much you want the new springs to drop it.
If you`d rather not go the custom spring route you could get a set of rear springs for a 3rd or 4th gen F body along with their rubber upper spring isolators (they only use a pigtail on the bottom). Try to get a similar rate or just slightly less than you`re running now,then trim the open upper coils until you get the ride height you want. It`ll increase the spring rate slightly but not enough to cause a problem unless you cut a LOT off.
Or you could get a set of comparable rate circle track rear spring in a shorter overall height and weld a set of spring jacks to the axle spring perches. Then you can set the ride height almost like you would with a coilover. We did this on out G-5 test car and it works really well. Mark SC&C