Overslung vs Underslung Axles – What’s the Difference?

Aug 9, 2022 | Trailer Axles

The following guide explains the differences between Overslung vs Underslung Axles.

When shopping for trailer parts, understanding the difference between overslung and underslung axles can be confusing.

Overslung vs Underslung Axles

Let’s break down the difference between these two parts to make ordering your trailer axles easy.

overslung vs underslung axles (2)

Image from HSI Duratek

What are Overslung Axles?

Overslung axles are easy to identify once you understand the term. It refers to the leaf spring that is attached to your axle. The leaf spring is a series of curved pieces of metal clamped together that provide suspension. On overslung axles, the leaf spring is positioned over the axle.

What are Underslung Axles?

As with overslung axles, underslung axles refer to the position of the leaf spring. In this case, the spring is positioned under the axle, instead of over it. 

Overslung vs Underslung Axles – Which Should I Choose?

Choosing between overslung and underslung trailer axles depends on how and where you will use your trailer.  The biggest difference between underslung versus overslung is the effect they have on the height of your trailer.  Overslung axles provide greater ground clearance, but you’ll end up sacrificing stability with the higher frame. They’re great for chunky terrain with little or no sharp turns.

Underslung axles provide lower ground clearance, but have greater stability. If you know you’ll be driving on winding or twisting roads but they are paved or smoother, you’ll need the additional stability. Choosing between overslung and underslung axles may seem like a simple choice at first, especially once you understand the difference.  However to ensure the safest and smoothest ride possible you need to make sure you pick the right one for your needs.

Contact BlueSwift Axles

Wondering which type of axle is right for you? Let our BlueSwift team guide you in the right direction. Check out our vast selection of trailer axles today and contact us with any questions you have.