TM 10-3930-669-34 (21) Install     magnetic base micrometer on differential housing (10). NOTE The     sealing     compound starts to harden in about 20 minutes. (22) Apply  sealing  compound  to  two  ring  nuts (13). NOTE Backlash  is  the  distance  a  tooth  of  a differential  gear  moves  between  two teeth    of    a    stationary    pinion    shaft gear. (23) Using  a  spanner  wrench,  install  ring  nut (13) in left intermediate cover (2) and right intermediate  cover  (3).  Tighten  to  obtain 0.006 to 0.007 in. (0.15-0.18 mm) backlash. (24) Measure   rotating   torque   of   pinion   shaft flange (25).  Record measurement. (25) Using   spanner   wrench,   tighten   ring   nut (13)   in   right   intermediate   cover   (3)   until rotating torque rises 3 to 4 lb-in (0.35-0.45 N•m) above the measurement recorded in Step (24). NOTE The  spanner  wrench  can  be  used  to adjust ring nuts slightly while installing    locks.        Rotating    torque must    remain    within    torque    range given. (26)    Install lock (12) with screw (11) on intermediate covers  (2  and  3),  and  bend  tabs  of  locks  onto ring nuts (13). 10-29