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I put tuff country 2" lift 52" springs in the front of mine. I had them on the back for a year and they are very flexy without the overload. They are rated at 405 lbs/in(fixed it) and are even less without the overload. I have ford towers and 14" bilsteins and I pretty much max them out.
When I built my bumpers a few years ago I cut off the frame to the front spring hanger so moveing the mount was not an option so, I used 0 rates to move the axle back to the stock location and 7.25 shackles in the stock location and 6* shims. I run 37"x12.5" mtrs and no inner fenderwells and dont have any clearance issues, fenders were trimmed a long time ago.
Works great flexes like mad and makes all my heep buddies jelous
I put tuff country 2" lift 52" springs in the front of mine. I had them on the back for a year and they are very flexy without the overload. They are rated at 405 ft/lbs and are even less without the overload. I have ford towers and 14" bilsteins and I pretty much max them out.
Springs are rated by the amount of weight they are able to support for each 1" of compression....the first 405 lbs compresses the spring 1", at 810 lbs the spring is compressed 2" from it's free-arch measurement, etc.
Ft/Lbs is an expression of torque, which most springs don't have.