6. To determine the proper ring and pinion teeth contact, you'll need to examine the contact pattern. Brush both sides of the ring gear, then rotate the painted section of the gear until it meshes with the pinion. You'll be examining both the drive (flat) and coast (concave) sides to find out exactly where the two meet. Many install kits come with instructions on what is an acceptable pattern. Depending on the pattern, you may need to adjust the pinion depth in the housing with shims and the carrier position side to side.