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I'm in the market to replace the rear leads on my 48. Couple of guys on here said they have swapped 49 springs in place. Went to the spring shop here in town and the old guy whipped out a book from 1956. According to the book the only difference between springs from 37-52 is deflection rate and the amount of leaves. 37-48 are all identical. From 49 on less leaves and deflection rates. Measurements are the same. My question is anyone swap to the 49 and later springs what rate did you use and what were the lowering measurements from original. Stock 48 springs are 800 lbs for standard duty and 1000lbs for HD. Later rates range from 520, 600, 640, 700. No springs from 49 on were over 700 unless they were on a wagon. Thanks.
