GMC 1990 Light Truck Repair Manual page 273

Figure 6—Separating the Carrier Case Halves
Figure 7—Removing the Lock Tabs
Figure 8—Removing the Side Bearing Cup
T TRUCK FRONT AXLE 4C3-5
J-21551
32
Figure 9—Remove the Sleeve Bearing
Figure 10—Removing the Pinion Nut
30. Bearing
32. Sleeve
F-01782
F-05788