Ok, so you are trying to remove the half shaft ? That's the proper name for that on a car with independant suspension. It is "half of an axle".
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RC people call that an axle, driveshaft, etc. It looks just like a telescoping driveshaft on a car, with universal joints, so... but I call them half shafts.
First, you need to remove the wheel hex. This will just pull off. There is a pin under it that goes through the axle. Make sure you don't lose it. Place the hex and pin somewhere safe. Those pins are notorious for growing legs and running off and never returning.
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After you get that off, the axle should push out the back of the spindle. They can sometimes be stuck in the bearings due to corrosion. If it's stuck, screw the wheel nut back onto the axle a few turns and tap on it to push the axle out of the spindle.
If it still won't come out, remove the two kingpins in the spindle to get it somewhere easier to work on it. The two undelined pins are the king pins. The arrow is pointing to the spindle.
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This is so true. Building an RC car from a kit is the most important way to learn how to work on an RC. Not only does it teach you how it all works, but it teaches you the order in which things come apart. At least with most RC's. I have seen some really messed up build manuals