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Yeah it looks like you might be running the wrong size of pinion gear. I would get the one from Hobbyking when they come back in stock as that was the one we designed the car around. If you want to make some super easy changes to the 3D printed gear to make it fit your current pinion gear, just change the tooth count variable in the gear part studio within our Onshape document and everything should reconfigure itself. I would not recommend moving the motor or jerry rigging any motor mounting solution because even the slightest bit of slip on either gear will cause them to totally shred into nothingness. Just change the tooth count and print a slightly larger rear gear.