F450 vs F350 SRW payload

RoyJ wrote:

4x4ord wrote:
^^^^ The thing is the GAWR of the F450 pickup is the same as the GAWR of the F350 4x4 pickup.The 4x2 F350 is a little more. More than likely the axle rating is limited on the F450 not by the axle itself but by the truck's rear suspension. We always talk on this forum about what it is to overload a truck .... is it going over the axle rating? or the tire rating? or the GVWR? and when it comes right down to it the little bit of weight that most of us consider putting on our trucks would never hurt anything anyway. An F450 is certainly more truck than most any RVer will ever need. Even my little F350 SRW has had 11,000 lbs of payload on its back and the tires didn't pop, the frame didn't break and as far as I know there was no ill consequence. If I had an F450 I certainly wouldn't be afraid to load what needs loading on its back.

In the order of consequences, 1) being most severe for "overloading":

1) Tires. Going over can mean imminent failure at high temp / speed. There is zero marketing built into tire load capacities

2) Axle limit from axle OEM - mostly driven by bearing load and housing strength. Again, very little marketing - when was the last time we saw a full page Dana S110 on social media?

3) Truck OEM axle rating - which includes suspension, brake, and the above. Now we're starting to see affects of marketing / legal / EPA / SAE...

4) Truck OEM GVW rating - heavily affected by factors beyond pure engineering specs, i.e. to fit within a "class"

According to this, the F550 uses the exact same 1.64" M300 as a F450 pickup, with a 14,706 lbs rating. So with upgraded leaf packs, I feel you can safely load well above the 9,900 lbs factory rating:

I appreciate what your saying hear Roy. Basically you're pointing out that with upgraded suspension a f450 could be loaded significantly beyond its rear axle rating and still fall within the design limits of all its components.... An f350 SRW may be capable of handling significantly more weight than what its RAWR suggests as well but not without violating the design limits of some of its components.

I don't agree with the idea that overloading tires means imminent tire failure at high temperature and speed as I've found there to be a pretty large safety factor incorporated into tire ratings. Obviously it depends how much one loads a tire over its rated capacity. Here's a couple pics showing my srw's tires and springs while the truck is loaded to more than double its rated payload ie with a 7000 lb pin weight placed on its hitch .