Ch 2 page 257 TRANSMISSION EXAMPLE 2: ADDENDUM TOOTH POSITION The contact pattern convex and concave is too close to the top. The contact pattern is too small and is not tangent to the middle of tooth. An adjustment is necessary! Adjustment: Install thicker pinion shim! The convex contact pattern must be tangent to the tooth centerline. A minimum of 50% of the tooth depth (flank) is covered. SHOP MANUAL