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Truck Axles Explained

There s a maximum weight per type of axle therefore to carry heavy weights trucks need multiple axles. A pickup truck isn t just a pickup truck.

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It s for those very reasons i always buy a new truck with one of the optional axle ratios typically 3 73s or 3 92s when the primary boat being towed is less than 21 foot.

Truck axles explained. The semi truck axles are also called the drive axles. When a truck is empty or part loaded then it doesn t legally need all three axles so trucks can be specified with a lift axle. A truck equipped with a lower axle ratio will do just that.

Trucks came with 6 4 regardless of the jobs they were designed to do. But when the truck or trailer is empty there s no reason to have those axles rolling when the weight is not there to justify it. There are class 1s class 8s half tons one tons light duty severe duty heavy duty light duty.

Take drive axle configurations for example. The drive axles impact a truck s ability to pull heavy loads the speeds it can travel at the overall fuel usage and conclusively the company s bottom line. However some fleets and drivers have been switching to 6 2 configurations in which only one of the rear axles receives power.

To find a truck s axle ratio check the exterior of the differential that is the device attached to the axle that lets the wheels turn at different speeds to see if it has a sticker. The actual amount of weight each axle is carrying is the gross axle weight or gaw. For a long time the standard was a 6 4 configuration in which both rear tandem axles receive power.

This is especially true of a vehicle equipped with a v 6 or small v 8. The distinction matters. On cars and trucks several senses of the word axle occur in casual usage referring to the shaft itself its housing or simply any transverse pair of wheels.

Strictly speaking a shaft which rotates with the wheel being either bolted or splined in fixed relation to it is called an axle or axle shaft however in looser usage an entire assembly including the surrounding axle. Best semi truck axle ratio. A truck s axle ratio tells you how much torque and towing capacity it can produce and it s an essential indicator of the vehicle s fuel economy.

What do they all mean. The basic metric to gauge to understand the affect a drive axle will have on your truck is the axle. Trucks have multiple axles with two or four tyres per axle to spread the weight over the road surface.

It s imperative that you don t confuse these two terms the gaw of a vehicle is constantly changing but the gawr will remain the same. This simply means that using hydraulics the whole extra axle can be lifted off the ground and kept that way whilst driving. As an example let s think of a pickup truck that s carrying a cargo bed full of boulders.

Lift axles can be places in between the two main normal axles.

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