TM10-3930-660-34 8-5. FRONT DIFFERENTIAL CARRIER ASSEMBLY - REPLACE/REPAIR/ADJUST (Cont’d) h.   Increase backlash by loosening bearing adjusting ring (15) opposite teeth of ring gear (22), and tightening bearing adjusting ring (15) on ring gear (22) side of differential assembly.  Make adjustments one notch at a time until backlash is within specifications. i. Decrease backlash by tightening bearing adjusting ring (15) opposite teeth of ring gear (22), and loosening bearing adjusting ring (15) on ring gear (22) side of differential assembly.  Make adjustments one notch at a time until backlash is within specifications. 4. CHECK TOOTH CONTACT PATTERNS OF THE GEAR SET. NOTE In the following steps,  movement of contact pattern in length of tooth is indicated as toward "toe" (C) or "heel" (D) of ring gear. NOTE Always check tooth contact patterns on drive side of gear teeth. a.   Apply marking compound (Prussian blue,  red lead...) to 12 gear teeth of ring gear.  Rotate ring gear so that 12 gear teeth are next to bevel pinion. b.   Rotate ring gear (22) forward and backward so that 12 marked teeth go past bevel pinion 6 times to get contact patterns.  Repeat,  if necessary,  to get a more clear pattern. 8-29