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I'm going to go down the robotics route instead of RC. Looks like a cheaper hobby too :) Thanks to all.

I see. I'll do some more research. Thanks. That's great, thank you for these suggestions, I'll check them out. I think you're right that I'm not likely to find an off-the-shelf vehicle that will be easily moddable to add encoders. Makes sense about the faster vehicles having open diffs...

A rotary encoder just gives an electrical signal when a shaft turns through a certain angle. It's a way to measure how fast an axle is turning in real-time

Thank you for the welcome and your reply. That Traxxas link is mouth-watering stuff! But total and utter overkill for me though. So rotary encoders are not a "thing" in the RC world, or do I misunderstand? I'd need non-locking diffs for my project.

I don't know much about the modern RC scene, so please bear with me. I'm looking for an electric 4x4 style car or truck that has the following attributes: Rotary encoders on all 4 wheels. Low speed - 10 mph is easily fast enough. Simple DC motor - not necessarily brushless (BLDC). Proper 4...