Chevrolet 1988 Light Duty Truck Repair Manual page 285

T TRUCK FRONT AXLE 4C3-11
Figure 23— Installing the Sleeve Bearing
6. Turn the left adjusting sleeve IN one notch using
J 33792.
7. Rotate the pinion several tim es to seat the bearings.
8. Install J 34047, J 25025-1 and J 8001-1 (figure 27).
9. Place the indicator stem at the heel end of a tooth.
Figure 22 — Measuring Pinion Bearing Preload