Spicer Tandem Drive Axles Service Manual D__R440, 460, 480, D_R461, 462, 463, 521, 581, 601, 651, 652, 653 - Manual (Page 90)

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Wheel Differential Lock
Air Shift Unit Replacement
Removal of Shift Unit
1. Disconnect air lines at shift unit cover.
2. Disconnect the wiring harness and remove selector
switch from the housing cover.
3. Remove nuts, flat washers and piston air shift unit
from the differential carrier.
Note: When shift unit is removed, provide container to catch
oil that escapes from reservoir.
4. Remove shift fork seal and spring assembly.
Note: Dana Service Manual AXSM-0029 for overhaul proce-
dures on air shift units is available.
Air Shift Unit Installation
1. Lubricate shift fork.
2. Slide shift fork seal and spring assembly over fork
and seal onto the shift unit carrier studs.
3. Place shift unit on mounting studs and make certain
shift fork actuating lever engages slot in shift fork.
4. Install flat washers and stud nuts.
• Torque 55-61 lbs. ft. (74-82 N•m)
Note: When axle is installed in vehicle, fill shift unit housing to
level of filler plug with SAE 10 oil [1.5 oz. (50 ml)]. Coat
threads of filler plug with sealer and install plug.
5. Thread selector switch in air shift unit and reconnect
wiring harness
6. Connect air lines to shift unit cover.