TM 10-3930-660-34 9-5 . REAR DIFFERENTIAL CARRIER ASSEMBLY - REPLACE/REPAIR/ADJUST (Cont’d) (1)   If old gear set is installed , backlash must be 0.008-0.018 inch or setting before carrier was disassembled. (2)   If new gear set is installed , backlash must be 0.012 inch. (3)   Adjust backlash as necessary by following STEPS f and g. NOTE When adjusting backlash ,  only the ring gear (18) and differential are adjusted; do not adjust the bevel pinion (29). f. Increase backlash by loosening bearing adjusting ring (12) on gear (18) side ,  and tightening bearing adjusting ring (12) away from ring gear (18) side of differential assembly .  Make adjustments one notch at a time until backlash is within specifications. g. Decrease backlash by tightening bearing adjusting ring (12) on ring gear (18) side ,  and loosening bearing adjusting ring (12) away from ring gear (18) 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" (F) or "heel" (G) of ring gear. NOTE Always check tooth contact patterns on drive side of gear teeth. 9-28