Animation in a car without affecting the physics? help!

Hello again, in a previous question, I asked about how to make a gear shift effect for a car

The example: look at the second 0:11 of this video: Need For Speed: Carbon - Nissan 240SX - Test Drive Gameplay (HD) [1080p60FPS] - YouTube

So, a user replied that this effect is ANIMATION, but how can I make an animation in a vehicle without affecting the speed, or the wheelcolliders, or the rigidbody?

Thank you!

Put your car’s model into a different gameobject (son of the gameobject with physics) and animate it @username