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Old 12-01-2019, 08:08 PM   #21
Theunz
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I'll go against the grain and say yes they will increase your payload, just not legally speaking. Remember on most 3/4 tons the only difference between it and a SRW one ton is one (evidently magical) leaf. That's it nothing else except the sticker on your door. So the airbag is nothing but a different type of spring which can actually support more weight then the one extra spring. NOTE TO WEIGHT POLICE...notice I am being very clear that this does not legally increase your payload, jut physically.
As for a smother ride, when I had them on my 05 F250 I found that they did help on dips and bridges but offered no improvement else ware. I find it hard to comprehend how stiffening your suspension can offer a smother ride unless you are constantly bottoming out. Most all who have posted after installing air bags report a smoother ride, with many claiming smoother even when empty. Go figure! Perhaps my butts just numb from to many years driving semi's
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Old 12-01-2019, 11:44 PM   #22
Gary-Alberta
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Using a GMC 2500 tow vehicle, I researched both, adding extra leaf spring each side, and adding air bags. In our tiny Canadian dollars, springs were $800, bags $1400. I did both.
The springs, obviously, increase the capacity of the suspension. The springs worked so well the bags really were not necessary.
You have to decide whether you believe that the modification increases the truck capacity. I have modified many vehicles in my time, and I believe that modifications DO change the vehicle. Many others do not agree.
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Old 12-02-2019, 02:26 PM   #23
TLightning
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Originally Posted by Gary-Alberta View Post
...You have to decide whether you believe that the modification increases the truck capacity. I have modified many vehicles in my time, and I believe that modifications DO change the vehicle...
Y'all driving 250/2500 trucks need to simply read the publications on weight and the definition for the terms regarding weight...you either are with in limits or you are out of limits. It's like being pregnant, you either are or you aren't, it's not a gray area.
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Old 12-02-2019, 11:05 PM   #24
Sandra_David
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TLightning, not sure what recourse I would have if my truck was indeed pregnant! Therefore, I hope like heck I do not own a pregnant truck. Concur with the manufacturer stated capacities. Airbags & helper springs may improve ride, but they don't change the capacities in question.
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Old 12-03-2019, 09:17 AM   #25
Slow Hand
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Originally Posted by Theunz View Post
I'll go against the grain and say yes they will increase your payload, just not legally speaking. Remember on most 3/4 tons the only difference between it and a SRW one ton is one (evidently magical) leaf. That's it nothing else except the sticker on your door. So the airbag is nothing but a different type of spring which can actually support more weight then the one extra spring. NOTE TO WEIGHT POLICE...notice I am being very clear that this does not legally increase your payload, jut physically.
As for a smother ride, when I had them on my 05 F250 I found that they did help on dips and bridges but offered no improvement else ware. I find it hard to comprehend how stiffening your suspension can offer a smother ride unless you are constantly bottoming out. Most all who have posted after installing air bags report a smoother ride, with many claiming smoother even when empty. Go figure! Perhaps my butts just numb from to many years driving semi's
This statement is so true. Some guys don't get it. . Oh it's the yellow sticker they holler. Don't go over that or the police will put you in the pokey. They make camping so much fun
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Old 12-03-2019, 05:24 PM   #26
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I will jump in and add some engineering on the air bag smoothing out the ride. Springs have constant support (unless you have variable travel springs - usually coil type springs) so the truck depresses the spring based on the weight, then the truck rebounds with the total strength of the spring until the spring is at the end of it’s travel. The air bag increases the pressure inside the bag as the truck pushes down effectively increasing the support the bag is providing and decreases as the truck rebounds, meaning the lifting pressure / push from the air bag will decrease as the pressure decreases, which will give you a lessening upward push, making the rebounding motion easier or as most would say, smoother. And as you may have guessed, I have air bags which I air up to about 35-40 psi to level up the rig.
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Old 12-03-2019, 06:17 PM   #27
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I didn't want airbags so I replaced the single camper spring with a 5-leaf pack. While I was in there, I put a 2" add-a-leaf under the main spring pack and a coil spacer in the front to balance it out. Unloaded, the ride feels marginally stiffer. When loaded, ride is really smooth and the bouncing over uneven roads or bridge joints is gone.



First pic is before on the driver's side...second is after on the passenger side.
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Old 12-03-2019, 09:54 PM   #28
Theunz
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Originally Posted by Twopetes View Post
I will jump in and add some engineering on the air bag smoothing out the ride. Springs have constant support (unless you have variable travel springs - usually coil type springs) so the truck depresses the spring based on the weight, then the truck rebounds with the total strength of the spring until the spring is at the end of itís travel. The air bag increases the pressure inside the bag as the truck pushes down effectively increasing the support the bag is providing and decreases as the truck rebounds, meaning the lifting pressure / push from the air bag will decrease as the pressure decreases, which will give you a lessening upward push, making the rebounding motion easier or as most would say, smoother. And as you may have guessed, I have air bags which I air up to about 35-40 psi to level up the rig.
I am certainly no engineer or suspension expert, but your idea that the air bags will rebound slower just doesn't seem to register in my mind. Air bags, like leaf springs are not progressive but linear, in essence if it takes 100lbs to compress one inch then it takes 200lbs to compress two inches. The rebound is therefore linear as well. The air bag will rebound just as fast as the steel spring, even faster if you have enough air in it to lift the truck higher then it was before you added air. So if you have a (the following numbers are arbitrary and I am using just for simplicity) 100 lb per inch leaf spring and add air to your bags the spring rate of the air bag is now in excess of 100 lbs, say 125lbs. Now while it will take an extra 25 lbs of force to compress your suspension one inch it will also have 25 more lbs of inertia to unload it. This is why we have shocks, and why quality shocks make a difference. Shocks have separate valves for rebound and compression which can slow down either the compression or rebound dictated by the manufactors design parimiters. Shocks on off road and racing vechicles usually have external adjustments so as to tailor the suspension for the desired effect. Now air ride suspension, bags without steel springs is a whole different conversation.
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Old 12-04-2019, 05:45 AM   #29
jeffba
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Just a fun musing here. if folks who advocate towing within manufacturer's spec are called Weight Police are those that advocate towing outside those limits called what Weight criminals? doesn't have a catchy ring to it. Need to work on it.
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Old 12-04-2019, 07:54 AM   #30
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Just a fun musing here. if folks who advocate towing within manufacturer's spec are called Weight Police are those that advocate towing outside those limits called what Weight criminals? doesn't have a catchy ring to it. Need to work on it.
Maybe weight outlaw LOL
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