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Old 10-04-2014, 03:15 PM   #21
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I think the engineers work backwards....they take a platform, so say a 250/350/450 and build the truck....then it goes over to the paperwork/pencil pusher dept and they slap a 10k gvwr sticker on it to stay below a certain ceiling for the vehicle...so then there is little they need to do to slap a 350 or 450 designation on them...for many years there really was not an appreciable difference...and even speaking with individuals who are directly involved with the process, I have NEVER been able to get a logical straight forward answer as to if a 250 would disintegrate into bits if loaded like a 350 is rated for...LOL

oddly enough I just got my truck registration in and the state of tx says I have a 8800gvwr and my payload is 1286lbs?? where these numbers came from I have no idea....
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Old 10-04-2014, 03:20 PM   #22
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That is the major difference with the Ford and Chevy going from 2500 to 3500. On the chevy it is just the rear spring packs. All else is the same. That is why you swap out the springs or add bags and you are good.
Sorry, you are wrong. Air bags DO NOT add payload. Springs, on the other hand, do. Air bags are just for load leveling, ride quality
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Old 10-04-2014, 03:24 PM   #23
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An air bag is a spring?..and technically neither add payload...its a set number. ..payload can ONLY be added by a special vehicle manufacturer. ..and the vehicle re registered.....technically. ..
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Old 10-04-2014, 03:31 PM   #24
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yes and no on an airbag being a spring. The manufactures all use steel springs for a reason. If the only difference between a 3/4 and 1 ton is the amount of rear springs, where do you think the huge payload difference comes from in the numbers they calculate?
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Old 10-04-2014, 03:56 PM   #25
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an air bag is a spring....just a different type. it carries the same load and provides the same functionality as a metal spring, and in many vehicles is the only spring system used...it is mounted between the axle and frame just as a metal spring...technically I guess it would be a "progressive rate spring" but any device that exerts constant tension and returns to its original shape is a "spring device"...

the reasons for a steel spring are more of a factor of cost/lifespan/durability than anything over any other spring method...

but you make the point exactly....if so the ONLY difference is an additional spring pack and the payload from a 3/4 ton to a 1 ton jumps up 1100lbs for an identically equipped vehicle it makes you go hmmmmmm.......right?
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Old 10-04-2014, 04:19 PM   #26
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its because leaf springs add payload. Air bags do not. They are marketed as "load leveling systems" for a reason. I'm guessing everything else in a 3/4 ton truck is up to par, it just needs a heavier leaf stack to qualify it for more payload
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Old 10-04-2014, 05:15 PM   #27
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I think we are going in circles.....I agree that a bag used in ADDITION to a leaf setup is a load leveler....or assist bag...

but payload is a function of several factors (springs included) and cannot be TECHNAICALLY increased without the intervention of a chassis builder and some tedious paperwork....sure you or I or anyone can make their truck handle additional payload better.....but you cant get a new door sticker (which ironically brought us here in the first place because we were saying the numbers were arbitrary)

anyway, many big rigs ONLY have bags for suspension.....and I have run bag only suspension on several of my custom trucks..in those cases it is referred to as an "air ride" suspension....

but I digress.....I have a brisket calling me.....GO TEXAS TECH!
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Old 10-04-2014, 11:09 PM   #28
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oddly enough I just got my truck registration in and the state of tx says I have a 8800gvwr and my payload is 1286lbs?? where these numbers came from I have no idea....
It is pretty common for the dealers to screw up. They copy everything over from the trade-in. I would get the dealer to fix it ASAP. I have had to do this for two vehicles. On one I waited until it was time to renew. By the time I had the paperwork corrected I had taken 15 hours off from work and spent the better part of 9 months. The second time, I made the dealer do it just as soon as I got the paperwork. It took them about 50 days to get it turned around and corrected.
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