GMC 1990 Light Truck Repair Manual page 283

T TRUCK FRONT AXLE 4C3-15
Figure 33—Installing the Differential
Pilot Bearing
( P I Inspect (Figure 35)
Tool Required:
J 33798 Engagement Tool
• Operation of the shift mechanism. Insert J 33798
into the shift fork. Turn the axle shaft while engaging
and disengaging the shift mechanism with the tool.
The mechanism should operate smoothly. If not,
remove the tube and check for damaged or
improperly installed parts.
Figure 34—Installing the Thrust Washer
Figure 32—Installing the Shift
Housing Seal