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    Home»Technology»What’s the Difference: Body-On-Frame vs Unibody
    Technology

    What’s the Difference: Body-On-Frame vs Unibody

    Nerd VoicesBy Nerd VoicesJuly 7, 2021Updated:July 7, 20214 Mins Read
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    Whether you’re in the market for a new or used car, if there’s one thing for certain, it’s that there’s a near-infinite amount of choice out there which can make it really difficult to make a decision. Without even having to do any research, however, it’s easy to see that crossover SUVs and pickup trucks are the two most popular classifications, at least in the USA. It would make sense then to go in that direction when shopping for a car, as these models seem to really appeal to people and it just helps to narrow down the options. Even so, the SUV and truck segments are incredibly extensive and diverse – there are still just so many options within just those two segments. 

    Looking at the pros and cons of certain aspects of SUVs and pickup trucks may help narrow the options down even further though. So here, we look at the differences between body-on-frame vehicles, such as the GMC Yukon, and unibody vehicles, such as the GMC Terrain to determine which would best suit one’s needs. So without further ado, here are the core qualities, drawbacks, and key differences of body-on-frame and unibody vehicles:

    What Is Body-on-Frame and Unibody Construction

    These two terms relate to the chassis construction of certain vehicles – each one carries its own advantages and disadvantages when it comes to the performance, drivability, capability, and day-to-day practicality of a car. The frame of a vehicle is also known as the chassis and it can be thought of as the vehicle’s vertebrae. It’s what the engine, transmission, drivetrain, and body are all attached to and it’s the defining constituent to the vehicles overall structure and purposing. 

    Body-On-Frame Design

    The first automobiles were built using rudimentary wooden frames devised from horse carriages called rolling chassis, which were simply mounted with an engine that would propel the wheels, and then later on, fitted with various cabin designs and seating configurations as the industry developed. The body-on-frame concept came about after a whole lot of innovation and it proved to be the most dependable and flexible as well as the safest. It was a low-profile chassis, or skateboard chassis, that could support various powertrains and a variety of body styles that would be hoisted onto and mounted to the chassis. It was favored for use in larger more able-bodied vehicles such as SUVs and trucks. 

    Pros

    • Supports a taller ride height and higher ground clearance, benefitting off-road capability
    • It allows for greater flexibility across the entire vehicle, benefitting off-road capability
    • These vehicles are generally very robust, allowing for really high max tow capacities

    Cons

    • These vehicles are typically large in size and very heavy, resulting in bad fuel economy
    • Their size and heft also make them relatively difficult to drive especially in urban areas
    • They’re more likely to rollover than other cars and they lack critical crumple zones

    Unibody Design

    The majority of modern cars utilize a unibody, or unitized body construction which is a design that integrates every constituent of the vehicle into a single whole. In other words, the vehicle’s body, floorboards, and chassis are all joined into a single structural element. It’s a lot more complex than a body-on-frame chassis and each and every vehicle requires its own design – meaning it can be expensive for automakers to develop. But they are, however, easier to mass produce once designed and they offer many benefits to consumers over body-on-frame vehicles. They are lighter and hence more frugal on gas, and they’re safer by virtue of their lower center of gravity’s and integration of crucial crumple zones. 

    Pros

    • Unibody vehicles are lighter and therefore deliver better gas mileage
    • Their lower center of gravity and more rigid frame make them less prone to a rollover
    • They are easier and safer to drive in urban settings thanks to more compact designs

    Cons

    • Unibody vehicles are not the best for taking off-road or for towing large amounts
    • If in an accident, unibody cars are usually far more expensive to repair by design
    • A completely new unibody chassis has to be designed for every new vehicle 

    So Which is Right for You?

    The right type of vehicle for you depends on what you’re planning to use it for. If you’re looking for something sturdy that can easily take the unbeaten path and tow however much you need it to, then a body-on-frame vehicle may be what you’re looking for. These are also usually cheaper to repair and maintain than unibody vehicles. Unibody vehicles, however, will deliver better handling, especially in urban settings, get you more miles per the gallon, and are, in general, just a lot safer than body-on-frame vehicles.

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    Nerd Voices
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