[FireSale]

Your spring info matches the PAC 1220 beehive spring. Is it this type of spring? It sounds like you want to change the rate and pressures of a spring you have to a spring you want and I don't think it works that way. You can change the seat and open pressures by changing the installed height but the spring rate is dialed into the spring in the manufacturing process. This spring installed at 1.780 with a .457 lift would give pressures of 192 and 362. You can tweak out the IS until you have a seat pressure of 170, but the open pressure will move in the same relationship that 192 is to 362. That's the spring rate doing that.