- Body - It may take some modifying to attach it to a different RC but if the body is still good (or you like the style and it just needs paint) keep it.
- Tires - Again, you might have to do some modifying to attach them to a different vehicle.
- Electronics - If they still work, some of the most useful salvage parts are motors and servos. You may also make use of circuit boards. If you pair up a circuit board from the vehicle with the corresponding transmitter or its circuit board you could use them in your own little RC toy building projects. If nothing else, they could be used to practice soldering. You can also pull out little LED lights and snip all the wires to reuse for practice soldering or when you just need some tiny bit of wire for something. You might even consider removing the contacts from the battery compartment. They could be used to build your own little battery holders.
- Gears - Hang on to those gears in case you strip the gears out of another toy. You may be able to match up a good set.
- Springs - Whether or not you keep the cheap plastic shocks, keep the springs. Use them for other projects, for crafts.
- Axle - If your RC has a nice solid metal axle, it could come in handy in other projects.
- Screws - One little RC toy will yield dozens of little screws. Always handy to have around for other projects and repairs.
I hope you've enjoyed this peek under the hood of a typical radio controlled toy truck. You may also want to take a look inside a typical RC toy transmitter.