GMC 1990 Light Truck Repair Manual page 298

4C4-12 K TRUCK FRONT AXLE
A. Button Located In Bore
B. Bearing Swung Out of Bore
C. Nut
D. Washer
E. Pilot
F. Flats
39. Bearing (Inner Pinion)
41. Bearing (Outer Pinion)
J 21777-35 (K15-25)
J 21777*8 (K35)
Figure 22—Measuring Pinion depth
J 36601-4 (K15-25)
J 36601-3 (K35)
J 29763
F-5869