So, with all of my research regarding the the height and inside diameter I found the springs are 10 inches high and 2.5 inches inside diameter. This is what is listed as the factory specifications. I measured the inside diameter and it actually is 2.75 inches. Has anyone else seen this.
So I just measured my front springs on my van. I used this formula to calculate the spring rate from my details Detailed measurements: d - wire diameter G - constant for steel springs D - inside diameter of spring N - Number of active coils when mounted Also the free length of the spring (no load) is 8.5 inches. d 10mm = .39 in G 11,250,000 D 70mm = 2.75 in N 6.5 (.39*.39*.39*.39)*115000000/(8*(2.75*2.75*2.75)*6.5) 266,045/1081= 246 lbs/in spring rate. So my conclusion is I have 250 lb springs. Also note these are metric springs and the stock mounts would not work with the generic coil over 2.5in I.D. springs that are out there.