You'll get my vote. I did that on my F-250 to change it to an F-350. It did require a visit to the Ford service desk to compare every part possible (diff, brakes, shocks, springs, spacers, trans). I found two things - the extra leaf spring, spacer and brackets, and the wheels and tires. The spring work has been done, and I am in the process of buying new wheels and tires to support the new weight rating.
I would strongly recommend you also check your tires to ensure they support the new weight. The best way is to find out what the factory tire size is on the 3500. They will probably be bigger than your 2500 unless you upgraded the tires when you bought your truck. My truck went from 10,000 GVWR and 6100 RAWR, to 11,200 (or 11,500 depending who you believe) GVWR and 7000 RAWR. I was overweight because of the pin and now I'm very close to not being over.
For the naysayers, this is a valid (and possibly complex) modification. To complete the upgrade one might (not must) recertify the truck to have the pillar label changed to reflect the new numbers, but this is ONLY required if you plan to use your truck for commercial purposes. Private owners do not have to recertify. In doing so, the new pillar will also include a new VIN which is how your state's DMV can charge more when renewing because you are potentially hauling heavier loads. I keep my parts list for the modifications just for the record but I have no plans for recertification. I only checked this out for California. Other states may vary.
My current GVW is 11,000 and the RAW is currently at 6,800 so now I am closer with my specification. With the current tires and wheels the GVWR is 10,400 and the RAW is 6,500 so you can see I am still a little overweight even with air bags. The new higher capacity wheels and tires will give me the margin I need (11,500 and 7,000). This works for me. Others do different things which work for them.
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