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The overall assembly can carry more weight than a semi-floating or non-floating axle assembly because the hubs have two bearings riding on a fixed spindle. A full-floating axle can be identified by a protruding hub to which the axle shaft flange is bolted. The semi-floating axle setup is commonly used on half-ton and lighter 4×4 trucks in the ...
The hub assembly is located between the brake drums or discs and the drive axle. A wheel is bolted on it. Depending on the construction, the end of the hub comes equipped with the splined teeth. They mate the teeth on the axle shaft. The axle hub spins along with the wheels bolted to it and provide power to the wheels in order to rotate.
When the front hubs are locked, even if no power is sent to the front axle (by means of a transfer case), the turning of the wheels will still spin the front axle, differential, and driveshaft, which puts extra load on the engine. Unlocking the hubs disconnects the wheels from the axle, which eliminates this extra load.
Rear axles offered include tri-drive options and planetary hub reduction axles from Renault Trucks. Air brake system has high flow air compressor and large air tanks to provide air for 2 or more trailers and the air starter (if fitted). Integrated vertical air intake snorkels keep dust and dirt out of the filters prolonging their life.
There are discernible differences between the GM and Ram versions, evident in the gaskets used and the axle cover designs. The GM AAM axle tubes exhibit a smaller diameter at the spindle compared to the AAM Dodge axles—measuring 4" for GM and 3.5" for Dodge from the housing. In design variation, newer GM trucks are aligned with Dodge axles.
In September 1998, the axle manufacturer Bentley Automotive agreed with Ford's findings. In October 1999, Ford's internal documents show lab testing proved the axle life could be doubled by heat treating, but would require initial retooling cost and result in $3.45 piece cost increase. No changes were made until March 2003. [17]
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