Also known as a cab chassis, or cab and chassis, this type of vehicle construction is built to allow customized assembly with aftermarket equipment. These vehicles, primarily light and medium duty commercial vans and trucks, are specialized for certain capabilities and service functions. The vehicle, as it is delivered to an upfitter for customization, is typically the chassis, drive train, and cab.


Your standard light duty pickup truck equipped with an enclosed cab and a pickup box or bed. Commonly used in recreational applications, these trucks are also designed with the versatility to accommodate some service related duties.


A box delete is often confused, understandably, with a chassis cab. A box delete has all of the characteristics of a pickup, except it is sold without the bed (also referred to as a box). These builds are also referred to as a “wide frame,” as the frame is almost as wide as the truck body. If you have, or plan to purchase, a box delete, treat it as a pickup when considering aftermarket products such as suspension enhancements.

What are some differences?


  • Most chassis cab trucks feature straight frame rails (a standard to accommodate aftermarket product manufacturers and truck/van upfitters)

  • Frame rails are 37 inches apart from one another

  • Cab to center of axle (CA) is 60 inches

  • More leaf springs in rear suspension spring assembly compared to a pickup – 5 to 12 leaf springs and a factory top or bottom overload spring depending on the vehicle make and GVWR

  • Shorter leaf springs compared to a pickup (shorter springs are stiffer, providing more capacity)


  • Pickups tend to have curved frame rails for increased ride quality and weight distribution

  • Frame rails are 34 inches apart from one another

  • Cab to center of axle (CA) is 56 inches

  • Fewer leaf springs in rear suspension spring assembly compared to a chassis cab – 2 to 4 leaf springs depending on the vehicle make and GVWR

  • Longer leaf springs compared to a chassis cab (longer springs flex easier, providing for a smoother ride)

How to determine the best SuperSprings part number?

Our engineers have tested a variety of SuperSprings, on all types of builds, and have designated specific part numbers for each build. Finding the right SuperSprings for your truck could be tricky… Unless of course, you use our interactive Application Guide!

What is going to help you make a decision, is the “Note,” placed to the right of the information. See the example below:

Note: For chassis cab models only; Do not use on pickup models; May be used on trucks equipped with top overload spring

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