4-30. REAR AXLE - Continued
4-30.5 Air Shift Units - Continued
Differential Lock Air Shift Unit Replacement
Inspect fittings (2 and 5). Replace if damaged or
Remove vent plug (12) and replace with 1/4 in.
setscrew. Coat threads of setscrew with
threadlock liquid (item 29, Appendix E) prior to
installation. Screw flush with housing.
Lubricate shift fork (10) and studs (11) with
Dexron (item 22, Appendix E). Push shift
unit onto housing (8) making sure shift fork
(10) and actuating lever in shift unit
Secure air shift unit using nuts (6) and washers (7).
Tighten nuts to 60 ft lb (80 Nm).
Fill shift unit housing with Dexron (item 22,
Appendix E) as detailed in lube order LO 5-4210-
Apply pipe sealant (Item 22, Appendix E) to pipe
thread of fittings (2 and 5) Install fittings to shift
unit and install control air and vent lines (1 and 4).
4-Wheel Drive Air Shift Unit Repair
All components in the 4-Wheel drive air shift unit are individually replaceable. Refer to
REPLACEMENT preceding for details of removal and installation. Whenever the shift unit is
repaired, all O-rings and felt oilers on piston should be replaced.