This exploded view should help with the assembly of the differential.
first build the central component of the differential with the knob gears, then attach the outer turntable components to it. Then the axles to the knob gears, and finally attach the 4 axles to the differential.
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These types of files are created with the LDraw system of software. You will need to install compatible software to open and view the instructions. A full list of available software is on the LDraw site.