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Originally posted by 01SalsaXterra:
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That's what I'm trying to explain. The spring rates do not add.

I would certainly expect the IFS system to run a much higher spring rate because the fulcrum of the control arms is so close. On a straight axle, there isn't so much leverage on the springs, making the spring rates much lower.

I believe mine has a 300 and a 250 on each shock. The effective spring rate is probably about 270. I'd be better off with 2 300's IMO.
Ok, that makes sense.
Does that mean if I went with dual rate springs I'd need two shorter springs between 550-700 lbs each?
eek
You probably won't need dual spring rates for IFS. The reason people use them for SASed rigs is because having a higher spring rate on the upper spring gives a little better ride height adjustment range. An IFS setup (like TC) should be about right if you follow mfg's recommendations.