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Could be the carbon motor brushes have popped out, flipped entirely or have turned on their sides. They're devilish things to keep in the right place during re-assembly.

I might be mistaken but it looks as if one or two of your AW Thunderjets on the back row of the photo to the left hand side just have rolling chassis underneath them - no innards. If so you should be able to swap the front and rear axles from those into your Ferrari chassis to return it to a more stock appearance.