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I'm finding the same thing. Most common gear is the 355 in these F350s, or at least almost all the SRW units out there. It is also rare to find one with the extra heavy payload rating. I'm not ready to buy yet and maybe it is a good thing.
 
The axles with the Chevy 2500/3500 are rated at 11,000 lbs so that is the payload limiting factor. My stock 2500 Duramax had a payload rating of 2800 lbs but I added a double leaf set of Supersprings and replaced the tires with Nitto tires rated at 3750 lbs at 80 PSI and added Rancho adjustable shocks, and even with a 4,000 lb load in the bed there was no sag and the truck was level and easy to manage on the highways.
 
Can you tell me where you got that number. I dont think I have seen axles with that high of a rating on a pick-up truck. The 2021 2500 is rated at 6600 lbs. Not sure about the 3500.
 
Nice looking truck. Are you sure that 14,000 lb. payload is correct. Fods F550 only has a max payload of 12,730 lbs. If thatis correct you have one heck of a truck.
14,000 would be the GVRW for an F350 with DRW.
 
The axles with the Chevy 2500/3500 are rated at 11,000 lbs so that is the payload limiting factor. My stock 2500 Duramax had a payload rating of 2800 lbs but I added a double leaf set of Supersprings and replaced the tires with Nitto tires rated at 3750 lbs at 80 PSI and added Rancho adjustable shocks, and even with a 4,000 lb load in the bed there was no sag and the truck was level and easy to manage on the highways.
2500/3500 do not have the same axles. So the 2500 has a front GAWR of 4400 lbs while the 3500 is rated at 4800 lbs. The 2500 has a rear axle rating of 6600 lbs and the 3500 is rated at 7250 lbs. for a SRW truck. The GVWR for the 2500 is 10,350 and the SRW 3500 is 11,150. As you can see they are not the same truck.

You have increased the springs and tires and shocks to haul heavier loads but did not install larger brakes so your truck is still only capable of hauling the original amount safely. Any time you substantially increase the load capacity of a truck you need to also do the brakes. You're talking about hauling almost 50% more than the truck was rated with the original size brakes? Wow. That's a dangerous thing to do. At some point it gets REALLY dangerous. I hope you never find that point.
 
Nice looking truck. Are you sure that 14,000 lb. payload is correct. Fods F550 only has a max payload of 12,730 lbs. If thatis correct you have one heck of a truck.
You're right. I wrote it down wrong. I'm definitely a newbie.
 

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