I built a RWD TC from scratch, the only chassis parts I didn't make were the knuckles, front axles and the hexes. It used chassis flex instead of suspension, and worked quite well. For about 3 laps. I think if I had access to the tools to do it again it would actually be pretty good. This car I built had the fiercest turn in I've ever seen on an RC. Even at top speed it could do a 180 turn in the width of the track, without the rear end coming loose. The main problem with it was that the chassis flexed around the motor mount, and I killed about half a dozen spur gears trying to sort it, and it never really worked right.
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