2500HD vs 3500SRW (again)

Based on info received here (and from a dealer), I thought I understood that an '06 3500SRW truck has ONE additional rear leaf spring per side on the rear axle. But here's another opinion: " The common approach is to add an additional leaf to an existing spring pack. That will give you more spring rate, but it won't be the equivalent of the SRW 3500's. Those have 7 leafs - a lower overload like the 2500hd's and an upper overload. The 3500 has overload spring stops on the frame for the upper overloads. The short bed 2500hd frame does not have those stops (or holes to bolt them to). I think you will be fine with an added leaf (but you were talking SRW 3500 equivalent); make sure your spring shop uses the right size "shackles" for the new spring pack that will now hold 5 leafs instead of 4. " Maybe this is in not really different