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Message: [QUOTE="Garbage_Mechanic, post: 1551105, member: 1610"] There are a couple of ways. On he end of the leafs or on the riveted on wrapper band the is a code like 4AC3. There is a chart out there to covert this to the weight rating and door tag code (X,V etc) the other is to accurately measure the thickness of each leaf at the center. Aftermarket spring catalogs have the leaf thickness and count, Ford part #, weight rating etc. Super Duty Spring is one. [/QUOTE]

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