How do overload leaf springs work?

The easiest way to understand how an overload leaf spring works is to think about it as if it were a muscle.


The yellow pencil above is pointing to your factory lower overload leaf springs. The majority of trucks, SUVs and vans have the lower and the upper overload leaf springs installed at the factory by the vehicle manufacturer. For the sake of simplicity, we will just talk about the lower overload leaf spring seen above.

The overload leaf spring AKA “the muscle,” is designed to help the vehicle when it becomes weighed down while towing or hauling something heavy such as a truck camper or a trailer.

How does the overload leaf spring “muscle” help?
When the vehicle, like a truck, is loaded down with a heavy weight, the rear begins to sag slightly. As the rear begins to sag it forces the lower overload leaf spring to come into contact with the other leaf springs above it.


Once the truck sags enough, most often several inches, the overload leaf springs begin to touch, and this begins to put the muscle into action.

It takes a sizeable weight to force them to come into contact on their own. Often times they don’t come into contact while the truck is towing or hauling leading to some massive negative side effects.

The negative side effects include side-to-side sway, body roll, poor handling, increased stopping distance, misaligned steering, increased tire wear and lack of control of the vehicle. Not only that, but now you are dealing with sag.

This is where the StableLoad suspension stabilizer comes in.


The StableLoad bolts onto the lower overload leaf spring.


The precision laser crafted StableLoads fit between the leaf spring overload gap to take up that empty space so the muscle is allowed to work immediately and to its maximum capability when towing or hauling. This results in dramatically improved handling characteristics and greatly reduces side-to-side sway, body roll and alleviates sag.

And even better, when you are not towing or hauling, the StableLoad is disengaged by simply rotating it away from the overload leaf spring while remaining bolted on when not in use. Doing so allows you to return to your factory ride when you are not towing or hauling.


Why do I want to have my StableLoads disengaged when I am not towing or hauling?
Disengaging the StableLoad allows for the gap between the overload leaf springs to return so you have a comfortable ride. The only time you want to have your StableLoads engaged is when you are towing and hauling. That gap between the overload leaf springs must be filled while towing and hauling to prevent poor handling, side-to-side sway, body roll and sag.

What is a common misconception about the overload leaf spring?
It is a common misconception that adding suspension upgrades to your vehicle will increase your vehicle’s factory towing or hauling capacity. The truth is, no towing, hauling or suspension upgrade can increase your factory towing/hauling maximum capacity ratings.

To ensure you are towing or hauling safely, have your vehicle inspected by a reputable towing or hauling equipment installation professional. If needed, upgrade your towing, hauling and suspension equipment to match the appropriate tongue weight and tow or hauling rating. Make sure it falls within your vehicle manufacturer’s tow ratings.

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How do StableLoads affect my factory overload leaf springs?

You might be wondering what the StableLoad suspension stabilizer can do for your suspension. The StableLoads dramatically improve handling while towing or hauling by preventing side-to-side sway, bounce, and body roll and more.

To understand how StableLoads offer these benefits, you first have to understand how they impact your vehicle manufacturer installed overload leaf springs.

We will start off by letting you know that when you use the StableLoad, not only do you get our legendary lifetime warranty with our product, but we also extend that warranty to your vehicle leaf springs when using the StableLoad.

Let’s briefly talk about how overload leaf springs work.

Lower overload leaf spring 

When you tow or haul a heavy load, it causes the rear of the vehicle to sag downward. Once the rear sags downward, it causes the leaf springs to begin to come into contact with the overload leaf springs, which is exactly what you want to have happen.

Lower overload leaf spring compresses under load

Once this happens, your overload leaf springs are beginning to be put to work but only at a small percentage of their total capability and they are starting to help you to manage what you are towing or hauling by making your ride safer and more comfortable. However, this only happens once the overload leaf springs come into contact with the rest of the leaf springs.

So, what are the problems with the sag and the delayed contact with the overload leaf spring?

The vehicle must drop down several inches in order to come into contact with the overload leaf springs leading to rear sag. When the rear of the vehicle sags it causes the front of the vehicle to lift up which causes the following problems:

  1. Front end steering is now out of proper steering alignment making the vehicle feel unsafe with a delayed steering response as though it is floating like a boat.
  2. The front of the vehicle is responsible for up to 70% of the vehicle’s stopping ability. The braking distance is extended due to significantly less weight on the front tires. The front of the vehicle is lifting up as the rear of the vehicle sags.
  3. Headlights are now pointing upward with the front of the vehicle creating a nighttime road hazard by blinding oncoming traffic.
  4. Tire wear is increased due to the misalignment of the steering leading to premature tire wear failure.
  5. Fuel mileage is decreased due to misalignment and uneven tire footprint from uneven load and vehicle riding unleveled.


How do StableLoads stabilize your vehicle?

The StableLoads stabilize your vehicle suspension by taking up the gap between the overloads forcing them to come into contact much sooner, significantly reducing sag and making your factory overload leaf springs operate at 100% of their capability. This enables them to maximize their contribution in creating a safe and pleasant driving experience.


So what happens when your overload leaf springs come into contact sooner with the StableLoads?

  1. Reduced sag
  2. Reduced body roll and sway
  3. Far better handling for driver control

Don’t take our word for it! We’re turning to our customer reviews to show how StableLoads make a significant difference.

Let’s see what Mike Ware from Brighton, Colorado had to say:

Click here to learn more about the StableLoad suspension stabilizer.

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