Pinion angle should be checked and adjusted any time there are changes made to the chassis that have an effect upon the ride height of the car or the length and location of the suspension link bars.
Correct pinion angle isn’t only important to a drag racer; it’s also very important in other forms of motorsports, along with any number of street vehicle applications.
Talk about pinion angle and you’ll get a dozen different opinions, and likely some arguments too.
Drag Race 101: Pinion Angle and Traction. You’ve just staged your car. The lights are counting down. At that very second, the green is lit, and you release the brakes to launch. Immediately, the tires on your car violently launch you forward. Almost just as fast, they unload, and start to spin. What happened?