Not sure, probably just the spring rates. All three of mine have different codes. The dually truck has a higher front GAWR, so I assume that it has stiffer springs. They all ride similar though.
bolt up wise they are the same. now spring codes will dictate weight and ride so basiclly what you have in leafs (4x4) is a high weight and low weight for the 250 then those translate to the 350 srw then the 350 drw will have the higher one and one even higher drw only. then if plow package was an option that year you can have one more level to the 350 drw for the srw and 250 they use one up
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