I read that stock coil springs on an xj are tested at 120lbs. I have a set of coil springs for a 6 1/2 in lift that I want to cut down for about a 3 1/2 to 4 inch lift that have a rating of 260lbs. Stock, uncompressed xj springs measure 16 1/4" while these new springs measure 23". With the difference in pounds of pressure, how can I figure out how much to cut off, rather than cutting inch by inch until i get it right. Any help would be greatly appreciated.