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You might be able to contact the tech help section at on of the shock companies. I'm sure they will want to know at least the weight of the truck, and maybe the weights on the front and rear axles. They may want you to measure the amount of travel you have now (or the amount you want to have) too. It never hurts to ask- unless she's married.
Thanks for the tip, I am going to check on this. The rear travel is close to original and it will remain like that. If I decide to lower it I will re locate the spring mounts about 1” at the most.
Seems to me the C/V springs are going to react different than rear leafs. Rather than trying to match front/rear shocks, you might end up trying different rear shocks to make the front/rear springs react the same. Like softer rears to H.D fronts.