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I'm working on my girl friends rig. I have 3 linked the front and will be 4 linking the rear. I need to start thinking about spring rates. The vhecile has 5" up travel and 9" down travel. The vehicle wieght is 4200lbs about VERY CLOSE. So what spring rates should I'd be looking for? I'm a race car guy. I use about 450lbs springs on a 975lbs car with a 2 to 1 motion ratio. I have know Idea were to start please help.

Thanks
Larry
 

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Larry -

Stock Jeep CJ Leaf Springs were 185lb-in -- higher with heavy duty or snow plow setups. Since CJs weighed in around 3500lbs, I'd say you're looking to start with a spring rate of around 225-250lb-in.

Also, double check your weight distribution front to rear. You may want stiffer springs in the front if you're nose heavy..
 

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I would look to be right around 225-250 also. I believe a little stiffer is better for side hilling as long as the spring is clamped at both ends....
 
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