I don't remember the name of it, but I played with a car in the 1970s that was purple and looked like a sedan and you wound it up, then hit a button and the body around the windshield lifted up, and the car stretched out from under the body until it was a hotrod with an exposed engine, then the car took off until the wheel springs unwound. No idea what happened to it or what it was called, but it was a cool toy, and no batteries required.
Edit: Found the toy line, but not the actual model (only Pinto and VW Bug are on youtube, but these ARE the toy, just different car models):
Edit 2: Found the picture of the one I had - it's the willy car in the middle:
imposters (resized).jpg
